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Santa Clara Co., California, USAi
Regional Level Types
Santa Clara Co.County
CaliforniaState
USACountry

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Locality type:
Largest Settlements:
PlacePopulation
San Jose1,026,908 (2017)
Sunnyvale151,754 (2017)
Santa Clara126,215 (2017)
Mountain View80,435 (2017)
Milpitas77,604 (2017)
Palo Alto66,853 (2017)
Other Languages:
French:
Comté de Santa Clara, Californie, États-Unis
German:
Santa Clara County, Kalifornien, Vereinigte Staaten
Italian:
Contea di Santa Clara, California, Stati Uniti d'America
Russian:
Санта-Клара, Калифорния, Соединённые Штаты Америки
Simplified Chinese:
聖塔克拉拉縣, 加利福尼亚州, 美国
Spanish:
Condado de Santa Clara, California, Estados Unidos
Albanian:
Santa Clara County, Kalifornia, Shtetet e Bashkuara të Amerikës
Arabic:
مقاطعة سانتا كلارا, كاليفورنيا, الولايات المتحدة
Armenian:
Սանտա Կլարա շրջան, Կալիֆոռնիա, Ամերիկայի Միացյալ Նահանգներ
Asturian:
Condáu de Santa Clara, California, Estaos Xuníos d'América
Basque:
Santa Clara konderria, Kalifornia
Bavarian:
Santa Clara County, Kalifornien, Vaoanigte Stootn
Bishnupriya Manipuri:
সান্তা ক্লারা কাউন্টি, ক্যালিফোর্নিয়া, তিলপারাষ্ট্র
Bulgarian:
Санта Клара, Калифорния, Съединени американски щати
Cebuano:
Santa Clara County, California
Czech:
Santa Clara County, Kalifornie, Spojené státy americké
Danish:
Santa Clara County, Californien, USA
Dutch:
Santa Clara County, Verenigde Staten
Egyptian Arabic:
مقاطعة سانتا كلارا, كاليفورنيا, امريكا
Esperanto:
Kantono Santa Clara, Kalifornio
Estonian:
Santa Clara maakond, California, Ameerika Ühendriigid
Farsi/Persian:
شهرستان سانتا کلارا، کالیفرنیا, کالیفرنیا, ایالات متحده آمریکا
Finnish:
Santa Claran piirikunta, Kalifornia, Yhdysvallat
Galician:
Condado de Santa Clara, California, Estados Unidos de América
Hebrew:
סנטה קלרה, קליפורניה, ארצות הברית
Hungarian:
Santa Clara megye, Kalifornia, Amerikai Egyesült Államok
Indonesian:
Santa Clara County, California, Amerika Serikat
Irish Gaelic:
Contae Santa Clara, California, Stáit Aontaithe Mheiriceá
Japanese:
サンタクララ郡, カリフォルニア州, アメリカ合衆国
Kapampangan:
Santa Clara County, California, Estados Unidos
Kazakh (Cyrillic Script):
Санта-Клара, Калифорния, Америка Құрама Штаттары
Korean:
샌타클래라 군, 캘리포니아주, 미국
Latin:
Santa Clara Comitatus, California, Civitates Foederatae Americae
Limburgian:
Santa Clara County, Californië, Vereinegde Staote vaan Amerika
Low Saxon/Low German:
Santa Clara County, Kalifornien, USA
Luxembourgish:
Santa Clara County, Kalifornien, Vereenegt Staate vun Amerika
Malayalam:
സാന്താ ക്ലാര കൗണ്ടി, കാലിഫോർണിയ
Navajo:
Tólą́ Nihiníyíní Áłtsʼíísí Bił Hahoodzo, Ahééháshį́į́h Hahoodzo, Wááshindoon Bikéyah Ałhidadiidzooígíí
Northern Frisian:
Santa Clara County, California, Feriind Stoote foon Ameerika
Norwegian:
Santa Clara County, California, USA
Polish:
Hrabstwo Santa Clara, Kalifornia, Stany Zjednoczone
Portuguese:
Condado de Santa Clara, Califórnia, Estados Unidos
Romanian:
Comitatul Santa Clara, California, Statele Unite ale Americii
Serbian:
Округ Санта Клара, Калифорнија, Сједињене Америчке Државе
Serbo-Croatian:
Santa Clara County, Kalifornija, Sjedinjene Američke Države
Swedish:
Santa Clara County, Kalifornien, USA
Tagalog:
Santa Clara County, California, Estados Unidos
Turkish:
Santa Clara County, Kaliforniya, Amerika Birleşik Devletleri
Ukrainian:
Санта-Клара, Каліфорнія, Сполучені Штати Америки
Urdu:
سانتا کلارا کاؤنٹی، کیلیفورنیا, کیلیفورنیا, ریاستہائے متحدہ امریکا
Vietnamese:
Quận Santa Clara, California, Chủng Quốc Hoa Kỳ
Waray:
Condado han Santa Clara, California, Estados Unidos
Western Punjabi:
سانتا کلارا کاؤنٹی, کیلیفورنیا, امریکہ


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Commodity List

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Mineral List

Mineral list contains entries from the region specified including sub-localities

88 valid minerals. 3 (TL) - type locality of valid minerals. 1 (FRL) - first recorded locality of unapproved mineral/variety/etc.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

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Alphabetical List Tree Diagram

Detailed Mineral List:

Aegirine
Formula: NaFe3+Si2O6
Description: Occurs abundantly in altered chert.
Reference: Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 246; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 393.; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033580.
Alabandite
Formula: MnS
Reference: Rogers, Austin Flint (1924b), Kempite, a new manganese mineral from Santa Clara County, California: American Journal of Science, 5th. Series: 8: 145-150; […(abstract): Geological Society of America Bulletin: 36: 206 (1925)]: 206; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 59; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 106; www.mineralsocal.org
Albite
Formula: Na(AlSi3O8)
Localities: Reported from at least 6 localities in this region.
Alleghanyite
Formula: Mn2+5(SiO4)2(OH)2
Reference: Rogers, Austin Flint (1919b), An interesting occurrence of manganese minerals near San Jose, California: American Journal of Science, 4th. Series: 48: 443; Ross, Clarence Samuel & Paul F. Kerr (1932), Manganese mineral of a vein near Bald Knob, North Carolina: American Mineralogist: 17: 13; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 61; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 413; www.mineralsocal.org
Almandine
Formula: Fe2+3Al2(SiO4)3
'Almandine-Pyrope Series'
Reference: Harris Mason specimen
Alumohydrocalcite
Formula: CaAl2(CO3)2(OH)4 · 4H2O
Colour: Pink
Description: Occurs as radiating structures as coatings on fracture surfaces of nickeliferous serpentine; also as isolated spheroidal groups, 0.1 to 1 mm, and earthy coatings.
Reference: Dunning, G.E., J.F. Cooper, and J.S. White (1975) Chromian alumohydrocalcite from California and knipovichite discredited. Mineralogical Record: 6: 180-183; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 198.
Alumohydrocalcite var: Chromian Alumohydrocalcite
Formula: Ca(Al,Cr)2(CO3)2(OH)4 · 4H2O
Colour: Pink
Description: Occurs as radiating structures as coatings on fracture surfaces of nickeliferous serpentine; also as isolated spheroidal groups, 0.1 to 1 mm, and earthy coatings.
Reference: Dunning, G.E., J.F. Cooper, and J.S. White (1975) Chromian alumohydrocalcite from California and knipovichite discredited. Mineralogical Record: 6: 180-183; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 198.
Amesite
Formula: Mg2Al(AlSiO5)(OH)4
Analcime
Formula: Na(AlSi2O6) · H2O
Reference: Kartchner, Wayne E. (1963), Minerals in Santa Clara County. Gems & Minerals, No. 308, May, 1963: 18; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 72.
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
'Apophyllite'
Description: Well-developed crystals line crevices in rock.
Reference: Clarke, F.W. (1889), A new occurrence of gyrolite: USGS Bulletin 64: 22-23; […American Journal of Science, 3rd. series: 38: 128-129]: 22 (128-129); Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 445.
Aragonite
Formula: CaCO3
'Aragotite' (FRL)
Formula: (C,H)
Type Locality:
Description: Impregnates siliceous dolomite.
Reference: Durand, F.E. (1873), Description of a new mineral from the New Almaden mine: California Academy of Science Proceedings: 4: 218; Hanks, Henry Garber (1884), Fourth report of the State Mineralogist: California Mining Bureau. Report 4, 410 pp.: 289; Hanks, Henry Garber (1905), Notes on “aragotite,” a rare California mineral: Royal Micr. Soc. Jour., 1905: 673-676; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 83.
Arsenopyrite
Formula: FeAsS
Description: Minor amounts occur in Hg ore. Bailey & Everhart question this occurrence.
Reference: Blake, Wm. P. (1854), Quicksilver mine of Almaden, California: American Journal of Science, 2nd. Series: 17: 439; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 87.
Azurite
Formula: Cu3(CO3)2(OH)2
Baryte
Formula: BaSO4
Bavenite
Formula: Ca4Be2Al2Si9O26(OH)2
Description: Reported as "Pilinite."
Reference: Bailey, Edgar H. & Donald L. Everhart (1964), Geology and quicksilver deposits of the New Almaden district, Santa Clara County, California: USGS PP 360: 102; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 289.
Bementite
Formula: Mn7Si6O15(OH)8
Description: Also occurs with unspecified Mn oxides.
Reference: Trask, Parker Davies, Ivan F. Wilson & F.S. Simons (1943), Manganese deposits of California – a summary report: California Division Mines Bulletin 125: 87; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 101.
Berthierine
Formula: (Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
'Bitumen'
Reference: Clarke, F.W. (1889), A new occurrence of gyrolite: USGS Bulletin 64: 22-23; […American Journal of Science, 3rd. series: 38: 128-129]: 22 (128-129); Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 81, 212.
Bornite
Formula: Cu5FeS4
Braunite
Formula: Mn2+Mn3+6(SiO4)O8
Calcite
Formula: CaCO3
Localities: Reported from at least 8 localities in this region.
Cassiterite
Formula: SnO2
Description: Occurs as fine large crystals reported from eclogites, quartzite and diorite.
Reference: Schrader, Frank Charles, R.W. Stone & Samuel Sanford (1917), Useful minerals of the United States (a revision of Bulletin 585): USGS Bulletin 624: 46; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 122.
'Chabazite'
Reference: Kartchner, Wayne E. (1963), Minerals in Santa Clara County. Gems & Minerals, No. 308 (May): 18; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 127.
'Chalcodite'
Formula: K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27
Reference: Hutton, C. Osborne, 1945, Further Data on the Stilpnomelane Mineral Group,American Mineralogist v.41 p. 608-615.
Chalcopyrite
Formula: CuFeS2
'Chlorite Group'
Chromite
Formula: Fe2+Cr3+2O4
Localities: Reported from at least 9 localities in this region.
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Description: Occurs as pseudomorphs after cuprite.
Reference: Rogers, Austin Flint (1910a), Notes on some pseudomorphs, petrifactions and alterations: American Philosophical Society Proceedings: 49: 20; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 144.
Cinnabar
Formula: HgS
Localities: Reported from at least 32 localities in this region.
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
'Clinoptilolite'
Reference: Murata, K.J. and Whiteley, K.R. (1973) Zeolites in the Miocene Brones sandstone and related formations of the central Coast Ranges, California. USGS Jour. Res.: 1: 256-257, 259; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 374.
Clinozoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Copper
Formula: Cu
Reference: Am Min 69:200-206
Corrensite
Formula: (Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
Cristobalite
Formula: SiO2
'Crossite'
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033580.
Cymrite
Formula: BaAl2Si2(O,OH)8 · H2O
Description: Occurs with inclusions of lawsonite as veinlets in jadeite graywacke near the W end only of the serpentine body exposed on the road.
Reference: Essene, E.J. (1967) An occurrence of Cymrite in the Franciscan formation, California. American Mineralogist: 52: 1885-1890; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 368.
'Deweylite'
Formula: Mg4Si3O10 · 6H2O ?
Description: Occurs as crusts.
Reference: Rogers, Austin Flint (1912b), Notes on rare minerals from California: Columbia University, School of Mines Quarterly: 33: 380; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 167.
Dolomite
Formula: CaMg(CO3)2
Localities: Reported from at least 9 localities in this region.
Epsomite
Formula: MgSO4 · 7H2O
Description: Abundant on mine walls as a post-mining product.
Reference: Bailey, Edgar H. & Donald L. Everhart (1964), Geology and quicksilver deposits of the New Almaden district, Santa Clara County, California: USGS PP 360: 102; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 179.
Fluorapatite
Formula: Ca5(PO4)3F
Description: Variety Voelckerite occurs as veinlike patches in glaucophane rock.
Reference: Rogers, Austin Flint (1914), A new locality for voelckerite, Santa Clara County, California, and the validity of voelckerite as a mineral species: Mineralogical Magazine: 17: 160; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 79.
Fluorite
Formula: CaF2
Colour: White
Description: Occurs as crystals.
Reference: Hart, T.S. (1853), Notes on the Almaden mine, California: American Journal of Science, 2nd. series: 16: 138; Irelan, William, Jr. (1890a), Ninth annual report of the State Mineralogist: California Mining Bureau. Report 9, 352 pp.: 46; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 188.
Franciscanite (TL)
Formula: Mn2+6(V5+,☐)2(SiO4)2(O,OH)6
Type Locality:
Reference: Amer.Min.(1986) 71, 1522-1526; www.mineralsocal.org
Gageite
Formula: Mn21(Si4O12)2O3(OH)20
Reference: Pete J. Dunn, Donald R. Peacor, Richard C. Erd, and Robert A. Ramik (1986) Franciscanite and örebroite, two new minerals from California and Sweden, related to redefined welinite. American Mineralogist, 71:1522-1526.
Galena
Formula: PbS
Ganophyllite
Formula: (K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
Colour: Brownish yellow
Description: Occurs as tabular crystals in seams with baryte.
Reference: Rogers, Austin Flint (1919b), An interesting occurrence of manganese minerals near San Jose, California: American Journal of Science, 4th. Series: 48: 446; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 192; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 410.; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077482.
'Garnet Group'
Formula: X3Z2(SiO4)3
Glaucophane
Formula: ◻[Na2][Mg3Al2]Si8O22(OH)2
Localities: Reported from at least 14 localities in this region.
Goethite
Formula: α-Fe3+O(OH)
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10262687.
Gold
Formula: Au
Description: Occurs as free gold included in garnets in omphacite-eclogite.
Reference: Holway, Ruliff S. (1904), Eclogites in California Journal of Geology: 12: 347; Smith, James Perrin (1906), The paragenesis of the minerals in the glaucophane-bearing rocks of California: American Philosophical Society Proceedings: 45: 203; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 196, 204.
Gyrolite
Formula: NaCa16Si23AlO60(OH)8 · 14H2O
Reference: Clarke, F.W. (1889), A new occurrence of gyrolite: USGS Bulletin 64: 22-23; […American Journal of Science, 3rd. series: 38: 128-129]: 22 (128-129); Bailey, Edgar H. & Donald L. Everhart (1964), Geology and quicksilver deposits of the New Almaden district, Santa Clara County, California: USGS PP 360: 102; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 478.
Harmotome
Formula: (Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
Reference: Erd, R.C. and Y. Ohashi (1981) Santaclaraite, a new manganese silicate from California, American Mineralogist; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 414; American Mineralogist (1984): 69: 200-206.
Hausmannite
Formula: Mn2+Mn3+2O4
'Heulandite subgroup'
Habit: Tabular crystals on (010) and elongate along the c-axis; drusy.
Description: Occurs in the Briones Sandstone.
Reference: Murata, K.J. and Whiteley, K.R. (1973) Zeolites in the Miocene Brones sandstone and related formations of the central Coast Ranges, California. USGS Jour. Res.: 1: 255-265; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 378.
Howieite
Formula: Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
Hydromagnesite
Formula: Mg5(CO3)4(OH)2 · 4H2O
Jadeite
Formula: Na(Al,Fe3+)Si2O6
Jarosite
Formula: KFe3+ 3(SO4)2(OH)6
Reference: Irelan, William, Jr. (1890a), Ninth annual report of the State Mineralogist: California Mining Bureau. Report 9, 352 pp.: 47; Bailey, Edgar H. & Donald L. Everhart (1964), Geology and quicksilver deposits of the New Almaden district, Santa Clara County, California: USGS PP 360: 102; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 233.
Kempite (TL)
Formula: Mn2+2(OH)3Cl
Type Locality:
Colour: Green
Description: Minute crystals.
Reference: Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 74; Rogers, Austin Flint (1924b), Kempite, a new manganese mineral from Santa Clara County, California: American Journal of Science, 5th. Series: 8: 145-150; […(abstract): Geological Society of America Bulletin: 36: 206 (1925)]: 145; Rogers, Austin Flint (1924b), Kempite, a new manganese mineral from Santa Clara County, California: American Journal of Science, 5th. Series: 8: 145-150; […(abstract): Geological Society of America Bulletin: 36: 206 (1925)]: 145; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 235; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 190.
Kutnohorite
Formula: CaMn2+(CO3)2
Description: Calcian material.
Reference: Erd, R.C. and Y. Ohashi (1981) Santaclaraite, a new manganese silicate from California, American Mineralogist; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 414; American Mineralogist (1984): 69: 200-206.
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Lawsonite
Formula: CaAl2(Si2O7)(OH)2 · H2O
Localities: Reported from at least 10 localities in this region.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10262687.
Lithiophorite
Formula: (Al,Li)MnO2(OH)2
Magnesite
Formula: MgCO3
Localities: Reported from at least 18 localities in this region.
Malachite
Formula: Cu2(CO3)(OH)2
'Manganese Oxides'
Localities: Reported from at least 18 localities in this region.
Marcasite
Formula: FeS2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Margarite
Formula: CaAl2(Al2Si2O10)(OH)2
Reference: Smith, James Perrin (1906), The paragenesis of the minerals in the glaucophane-bearing rocks of California: American Philosophical Society Proceedings: 45: 203; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 256; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 432.
Melanophlogite
Formula: 46SiO2 · 6(N2,CO2) · 2(CH4,N2)
Habit: Cubes
Colour: Colorless
Description: Occurs as adamantine cubes up to 5 mm on an edge on cristobalite in a metamorphosed serpentine vein.
Reference: Cooper, J.F. & G.E. Dunning (1972), Melanophlogite from Mount Hamilton, Santa Clara County, California: American Mineralogist: 57: 1494, 1495; Cooper, J.F. & G.E. Dunning (1973), Melanophlogite from Mount Hamilton, Santa Clara County, California: Erratum: American Mineralogist: 58: 346; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 354, 357; Mineralogical Record (2002): 33: 239.
Mercury
Formula: Hg
Localities: Reported from at least 8 localities in this region.
Metacinnabar
Formula: HgS
Reference: No reference listed
Millerite
Formula: NiS
Description: Occurs in Hg ores.
Reference: Bailey, Edgar H. & Donald L. Everhart (1964), Geology and quicksilver deposits of the New Almaden district, Santa Clara County, California: USGS PP 360: 99; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 65.
Mordenite
Formula: (Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Description: Occurs as small, stubby crystals along borders of opal veins in a clinoptilolite-rich ash bed of the Briones Formation.
Reference: Murata, K.J. and Whiteley, K.R. (1973) Zeolites in the Miocene Brones sandstone and related formations of the central Coast Ranges, California. USGS Jour. Res.: 1: 256-257, 259; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 374.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Muscovite var: Illite
Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2
Reference: Barrel Sidney Cowan (1978) Petrology and Structure of the Franciscan Assemblage Northwest of Pacheco Pass, California. PhD thesis Stanford University
Muscovite var: Phengite
Formula: KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Description: Occurs in serpentine.
Reference: Kartchner, Wayne E. (1963), Minerals in Santa Clara County. Gems & Minerals, No. 308 (May): 22; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 277.
Opal
Formula: SiO2 · nH2O
'Orbicular Jasper'
Reference: Melhase, John (1934), A diversity of many fine minerals available in California for collectors: Oregon Mineralogist: 2(7): 7; Mineralogist, The (1935): 3(3): 34; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 318; www.cst.cmich.edu/users/dietr1rv/jasper.htm
'Psilomelane'
Formula: Mn, O
Localities: Reported from at least 8 localities in this region.
'Pumpellyite'
Description: Occurs in Franciscan Formation rocks.
Reference: McKee, Bates (1962), Aragonite in the Franciscan rocks of the Pacheco Pass, California: American Mineralogist: 47: 382, 384; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 299-300, 353; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 492.
Pyrite
Formula: FeS2
Pyrochroite
Formula: Mn(OH)2
Reference: Rogers, Austin Flint (1919b), An interesting occurrence of manganese minerals near San Jose, California: American Journal of Science, 4th. Series: 48: 445; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 235, 302; www.mineralsocal.org; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077482.
Pyrolusite
Formula: Mn4+O2
'Pyroxene Group'
Description: Reported as "jadeitic pyroxene."
Reference: Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 404.
Pyrrhotite
Formula: Fe7S8
Description: Occurs in ore.
Reference: Davis, Fenelon Francis & C.W. Jennings (1954), Mines and mineral resources of Santa Clara County, California: California Journal of Mines and Geology: 50: 340; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 312; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 70.
Quartz
Formula: SiO2
Localities: Reported from at least 26 localities in this region.
Quartz var: Agate
Reference: Butler, 1995. Rockhounding California, p.135.
Quartz var: Chalcedony
Formula: SiO2
Localities: Reported from at least 7 localities in this region.
Quartz var: Jasper
Localities: Reported from at least 6 localities in this region.
Quartz var: Myrickite
Formula: SiO2
Reference: Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 318.
Rhodochrosite
Formula: MnCO3
Localities: Reported from at least 7 localities in this region.
Rhodonite
Formula: Mn2+SiO3
Riebeckite
Formula: ◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2
Reference: Am Min 69:200-206
'Riebeckite Root Name'
Formula: ◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2
Reference: Rogers, Austin Flint (1912), Notes on rare minerals from California: Columbia University, School of Mines Quarterly: 33: 377; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 70.
'Riebeckite Root Name var: Crocidolite'
Formula: ◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2
Reference: Rogers, Austin Flint (1912), Notes on rare minerals from California: Columbia University, School of Mines Quarterly: 33: 377; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 70.
Rutile
Formula: TiO2
Description: Occurs as rough crystals in glaucophane schist.
Reference: Mineralogist, The (1936), “Showy California minerals” (advertisement): Mineralogist: 4(3): 41; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 326.
Santaclaraite (TL)
Formula: CaMn4[Si5O14OH](OH) · H2O
Type Locality:
Colour: Pink
Reference: Erd, R.C. and Y. Ohashi (1981) Santaclaraite, a new manganese silicate from California, American Mineralogist: 66: 154-168; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 414; American Mineralogist (1984): 69: 200-206.; Pete J. Dunn, Donald R. Peacor, Richard C. Erd, and Robert A. Ramik (1986) Franciscanite and örebroite, two new minerals from California and Sweden, related to redefined welinite. American Mineralogist, 71:1522-1526.
Saponite
Formula: Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Senarmontite ?
Formula: Sb2O3
Description: Possible crystals.
Reference: Goldsmith, E. (1873), Stibioferrite, a new mineral from Santa Clara County, California: Academy of Natural Sciences Philadelphia Proceedings: 25: 369; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 334.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Localities: Reported from at least 37 localities in this region.
'Serpentine Subgroup var: Nickeliferous Serpentine'
Formula: D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Reference: Dunning, G.E., J.F. Cooper, and J.S. White (1975) Chromian alumohydrocalcite from California and knipovichite discredited. Mineralogical Record: 6: 180-183; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 198.
Siderite
Formula: FeCO3
'Smectite Group'
Formula: A0.3D2-3[T4O10]Z2 · nH2O
Sonolite
Formula: Mn2+9(SiO4)4(OH)2
Reference: Pete J. Dunn, Donald R. Peacor, Richard C. Erd, and Robert A. Ramik (1986) Franciscanite and örebroite, two new minerals from California and Sweden, related to redefined welinite. American Mineralogist, 71:1522-1526.
Sphalerite
Formula: ZnS
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10040741.
'Stibioferrite'
Reference: Goldsmith, E. (1873), Stibioferrite, a new mineral from Santa Clara County, California: Academy of Natural Sciences Philadelphia Proceedings: 25: 369; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 379.
Stibnite
Formula: Sb2S3
Localities: Reported from at least 6 localities in this region.
Stilpnomelane
Formula: (K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Tephroite ?
Formula: Mn2+2SiO4
Habit: massive
Colour: Grayish red
Description: Tephroite reported by Rogers is most likely alleghanyite, as per the comments in the type locality description of alleghanyite published in "Ross, Clarence Samuel & Paul F. Kerr (1932), Manganese mineral of a vein near Bald Knob, North Carolina: American Mineralogist: 17: 1-18". A new analysis is needed to confirm.
Reference: Rogers, Austin Flint (1919b), An interesting occurrence of manganese minerals near San Jose, California: American Journal of Science, 4th. Series: 48: 444; Rogers, Austin Flint (1924b), Kempite, a new manganese mineral from Santa Clara County, California: American Journal of Science, 5th. Series: 8: 145-150; […(abstract): Geological Society of America Bulletin: 36: 206 (1925)]: 206; Ross, Clarence Samuel & Paul F. Kerr (1932), Manganese mineral of a vein near Bald Knob, North Carolina: American Mineralogist: 17: 13; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 59, 362; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 460; www.mineralsocal.org; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Thunder Egg'
Reference: Cisneros, Eugene (2013), Mineralogical Research Company, private communication to Mindat/org.
Tiemannite
Formula: HgSe
Reference: Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 367.
Titanite
Formula: CaTi(SiO4)O
Ulexite
Formula: NaCa[B5O6(OH)6] · 5H2O
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10165116.
Uvarovite
Formula: Ca3Cr2(SiO4)3
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Valentinite
Formula: Sb2O3
Description: Small crystals.
Reference: Goldsmith, E. (1873), Stibioferrite, a new mineral from Santa Clara County, California: Academy of Natural Sciences Philadelphia Proceedings: 25: 369; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 379.
'Wad'