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Hunting Hill quarry (Rockville Crushed Stone Quarry; Travilah Quarry; Rockville Quarry; Bardon Stone Quarry; Aggregate Industries Quarry), Rockville, Montgomery Co., Maryland, USA

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Latitude & Longitude (WGS84): 39° 5' North , 77° 9' West
Latitude & Longitude (decimal): 39.08333,-77.15000
GeoHash:G#: dqcnk6vhf
Locality type:Quarry
Köppen climate type:Cfa : Humid subtropical climate


A large active quarry (as of December, 2013) in the Ordovician-age Hunting Hill pluton. The pluton in the quarry is thought to be originally a dunite, now largely serpentinized. Gabbro dikes cutting the serpentinite have been converting via metasomatism to rodingite, a mixture of calcium-rich clinopyroxene (here a green chromium-rich diopside) and a pink to white grossular garnet. Shearing along the contacts between the more resistant rodingite and the weaker serpentinite as well as within the rodingite has provided space for veins and open-space fillings of a suite of bizarre often well-crystallized minerals. Over 60 minerals have been reported so far from the quarry, according to the excellent article by Parker (2005). Notable finds are red gemmy grossular crystals, coalingite masses, desautelsite, prehnite crystals, mcguinnessite and calcite crystals.



Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


59 valid minerals.

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Description: ACTINOLITE. ALBITE. (Reported by J. Griesbach, 1975). ANTHOPHYLLITE. Creamy gray veinlets in serpentinite float. ANTIGORITE. (G. T. Faust, 1967). Constitutes bulk of serpentinite as interlocking microscopic laths and plates or as tough, brittle, dark
Reference: Jack Nelson, Compiler from two references and personal communications, May 2000 (See descriptive notes for quarry for reference citations)>
'commodity:Aggregates'
Reference: From USGS MRDS database
Albite
Formula: Na(AlSi3O8)
Reference: [www.johnbetts-fineminerals.com]
'Albite-Anorthite Series'
Description: Analysed by Bart Cannon; see http://www.mindat.org/mesg-5-40618.html
Reference: Jon Ertman collection
Anthophyllite
Formula: ☐{Mg2}{Mg5}(Si8O22)(OH)2
Reference: minerals of washington d.c. area; L.R. Bernstein
Antigorite
Formula: Mg3(Si2O5)(OH)4
Reference: minerals of washington d.c. area; L.R. Bernstein
Aragonite
Formula: CaCO3
Reference: minerals of washington d.c. area; L.R. Bernstein
Azurite
Formula: Cu3(CO3)2(OH)2
Reference: minerals of washington d.c. area; L.R. Bernstein
'Biotite' ?
Reference: minerals of washington d.c. area; L.R. Bernstein
Bornite
Formula: Cu5FeS4
Reference: Min Rec 36:4 pp 435-446
Brochantite
Formula: Cu4(SO4)(OH)6
Reference: minerals of washington d.c. area; L.R. Bernstein
Brucite
Formula: Mg(OH)2
Reference: minerals of washington d.c. area; L.R. Bernstein
Calcite
Formula: CaCO3
Reference: minerals of washington d.c. area; L.R. Bernstein
Chalcocite
Formula: Cu2S
Description: ACTINOLITE. ALBITE. (Reported by J. Griesbach, 1975). ANTHOPHYLLITE. Creamy gray veinlets in serpentinite float. ANTIGORITE. (G. T. Faust, 1967). Constitutes bulk of serpentinite as interlocking microscopic laths and plates or as tough, brittle, dark
Reference: Jack Nelson, Compiler from two references and personal communications, May 2000 (See descriptive notes for quarry for reference citations)>
Chalcopyrite
Formula: CuFeS2
Reference: minerals of washington d.c. area; L.R. Bernstein
Chromite
Formula: Fe2+Cr3+2O4
Reference: Ref.: Minerals in the Washington D.C. Area.
Chrysocolla ?
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Reference: minerals of washington d.c. area; L.R. Bernstein
Chrysotile
Formula: Mg3(Si2O5)(OH)4
Reference: minerals of washington d.c. area; L.R. Bernstein
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: minerals of washington d.c. area; L.R. Bernstein
Clinozoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Reference: minerals of washington d.c. area; L.R. Bernstein
Coalingite
Formula: Mg10Fe3+2(OH)24[CO3] · 2H2O
Reference: minerals of washington d.c. area; L.R. Bernstein
Desautelsite
Formula: Mg6Mn3+2(OH)16[CO3] · 4H2O
Reference: Min Rec 36:4 pp 435-446
'Deweylite'
Formula: Mg4Si3O10 · 6H2O ?
Reference: F. Parker (2005) "The Minerals of the Hunting Hill Quarry, Rockville, Maryland" Mineralogical Record 35:435-446.
Diopside
Formula: CaMgSi2O6
Description: ACTINOLITE. ALBITE. (Reported by J. Griesbach, 1975). ANTHOPHYLLITE. Creamy gray veinlets in serpentinite float. ANTIGORITE. (G. T. Faust, 1967). Constitutes bulk of serpentinite as interlocking microscopic laths and plates or as tough, brittle, dark
Reference: Jack Nelson, Compiler from two references and personal communications, May 2000 (See descriptive notes for quarry for reference citations)>
Diopside var: Chromian Diopside
Formula: Ca(Mg,Cr)Si2O6
Reference: F. Parker (2005) "The Minerals of the Hunting Hill Quarry, Rockville, Maryland" Mineralogical Record 35:435-446.
Dolomite
Formula: CaMg(CO3)2
Reference: Ref.: Minerals in the Washington D.C. Area.
Dravite
Formula: Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Min Rec 36:4 pp 435-446
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: minerals of washington d.c. area; L.R. Bernstein
'Fayalite-Forsterite Series'
Reference: minerals of washington d.c. area; L.R. Bernstein
Fluorapatite
Formula: Ca5(PO4)3F
Reference: Mineralogical Record (2005): 36: 435-446.
Galena
Formula: PbS
Reference: Min Rec 36:4 pp 435-446
Goethite
Formula: α-Fe3+O(OH)
Reference: Min Rec 36:4 pp 435-446
Grossular
Formula: Ca3Al2(SiO4)3
Reference: [www.johnbetts-fineminerals.com]
'Grossular-Hibschite Series'
Reference: minerals of washington d.c. area; L.R. Bernstein
Hematite
Formula: Fe2O3
Reference: minerals of washington d.c. area; L.R. Bernstein
Huntite
Formula: CaMg3(CO3)4
Reference: minerals of washington d.c. area; L.R. Bernstein
Hydromagnesite
Formula: Mg5(CO3)4(OH)2 · 4H2O
Reference: minerals of washington d.c. area; L.R. Bernstein
Ilmenite
Formula: Fe2+TiO3
Reference: Min Rec 36:4 pp 435-446
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: minerals of washington d.c. area; L.R. Bernstein
Lizardite
Formula: Mg3(Si2O5)(OH)4
Reference: minerals of washington d.c. area; L.R. Bernstein
Magnesio-hornblende
Formula: ☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Reference: Jonathan Harris Collection; ;
Magnesite
Formula: MgCO3
Reference: minerals of washington d.c. area; L.R. Bernstein
Magnetite
Formula: Fe2+Fe3+2O4
Reference: minerals of washington d.c. area; L.R. Bernstein
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Min Rec 36:4 pp 435-446
'Manganese Oxides'
Reference: F. Parker (2005) "The Minerals of the Hunting Hill Quarry, Rockville, Maryland" Mineralogical Record 35:435-446.
'Manganese Oxides var: Manganese Dendrites'
Reference: F. Parker (2005) "The Minerals of the Hunting Hill Quarry, Rockville, Maryland" Mineralogical Record 35:435-446.
Mcguinnessite
Formula: (Mg,Cu)2(CO3)(OH)2
Reference: Min Rec 36:4 pp 435-446
Millerite
Formula: NiS
Reference: Min Rec 36:4 pp 435-446
Molybdenite
Formula: MoS2
Reference: Min Rec 36:4 pp 435-446
Nimite
Formula: (Ni,Mg,Al)6((Si,Al)4O10)(OH)8
Reference: Min Rec 36:4 pp 435-446
Omphacite
Formula: (NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6
Reference: David Schoeberlein Collection
Opal
Formula: SiO2 · nH2O
Reference: minerals of washington d.c. area; L.R. Bernstein
Palladium ?
Formula: (Pd,Pt)
Description: Traces reported by David Marcel Larrabee (1969) (No evidence presented that the native element mineral is present.)
Reference: Minerals of Washington D.C. Area; L.R. Bernstein
Pargasite
Formula: {Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
Reference: Min Rec 36:4 pp 435-446
Pentlandite
Formula: (FexNiy)Σ9S8
Reference: Min Rec 36:4 pp 435-446
Platinum ?
Formula: Pt
Description: Traces reported by David Marcel Larrabee (1969) (No evidence presented that the native element mineral is present.)
Reference: Minerals of Washington D.C. area; L.R. Bernstein
Pokrovskite
Formula: Mg2(CO3)(OH)2
Reference: Min Rec 36:4 pp 435-446
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Reference: Minerals of Washington D.C. Area; L.R. Bernstein; Rocks & Min.:61:347.
Pyrite
Formula: FeS2
Reference: minerals of washington d.c. area; L.R. Bernstein
Pyrrhotite
Formula: Fe7S8
Reference: minerals of washington d.c. area; L.R. Bernstein
Quartz
Formula: SiO2
Reference: minerals of washington d.c. area; L.R. Bernstein
Quartz var: Chalcedony
Formula: SiO2
Reference: Ref.: Minerals in the Washington D.C. Area.
Rutile
Formula: TiO2
Reference: Min Rec 36:4 pp 435-446
Talc
Formula: Mg3Si4O10(OH)2
Reference: minerals of washington d.c. area; L.R. Bernstein
Titanite
Formula: CaTi(SiO4)O
Reference: Min Rec 36:4 pp 435-446
Tochilinite
Formula: Fe2+5-6(Mg,Fe2+)5S6(OH)10
Reference: Min Rec 36:4 pp 435-446
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: minerals of washington d.c. area; L.R. Bernstein
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Reference: minerals of washington d.c. area; L.R. Bernstein
Vesuvianite
Formula: (Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Reference: minerals of washington d.c. area; L.R. Bernstein
Xonotlite
Formula: Ca6(Si6O17)(OH)2
Reference: [MinRec 30:467]
Zoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Reference: Ref.: Minerals in the Washington D.C. Area.
Zoisite var: Thulite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Description: ACTINOLITE. ALBITE. (Reported by J. Griesbach, 1975). ANTHOPHYLLITE. Creamy gray veinlets in serpentinite float. ANTIGORITE. (G. T. Faust, 1967). Constitutes bulk of serpentinite as interlocking microscopic laths and plates or as tough, brittle, dark
Reference: Jack Nelson, Compiler from two references and personal communications, May 2000 (See descriptive notes for quarry for reference citations)>

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Palladium' ?1.AF.10(Pd,Pt)
'Platinum' ?1.AF.10Pt
Group 2 - Sulphides and Sulfosalts
'Bornite'2.BA.15Cu5FeS4
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
'Millerite'2.CC.20NiS
'Molybdenite'2.EA.30MoS2
'Pentlandite'2.BB.15(FexNiy)Σ9S8
'Pyrite'2.EB.05aFeS2
'Pyrrhotite'2.CC.10Fe7S8
Tochilinite2.FD.35Fe2+5-6(Mg,Fe2+)5S6(OH)10
Group 4 - Oxides and Hydroxides
'Brucite'4.FE.05Mg(OH)2
Chromite4.BB.05Fe2+Cr3+2O4
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
'Opal'4.DA.10SiO2 · nH2O
'Quartz'4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
'Rutile'4.DB.05TiO2
Group 5 - Nitrates and Carbonates
'Aragonite'5.AB.15CaCO3
'Azurite'5.BA.05Cu3(CO3)2(OH)2
'Calcite'5.AB.05CaCO3
Coalingite5.DA.55Mg10Fe3+2(OH)24[CO3] · 2H2O
Desautelsite5.DA.50Mg6Mn3+2(OH)16[CO3] · 4H2O
Dolomite5.AB.10CaMg(CO3)2
Huntite5.AB.25CaMg3(CO3)4
Hydromagnesite5.DA.05Mg5(CO3)4(OH)2 · 4H2O
Magnesite5.AB.05MgCO3
Malachite5.BA.10Cu2(CO3)(OH)2
'Mcguinnessite'5.BA.10(Mg,Cu)2(CO3)(OH)2
'Pokrovskite'5.BA.10Mg2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Brochantite'7.BB.25Cu4(SO4)(OH)6
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
'Actinolite'9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
'Albite'9.FA.35Na(AlSi3O8)
'Anthophyllite'9.DE.05☐{Mg2}{Mg5}(Si8O22)(OH)2
'Antigorite'9.ED.15Mg3(Si2O5)(OH)4
Chrysocolla ?9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Chrysotile9.ED.15Mg3(Si2O5)(OH)4
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
Clinozoisite9.BG.05a{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Diopside9.DA.15CaMgSi2O6
var: Chromian Diopside9.DA.15Ca(Mg,Cr)Si2O6
Dravite9.CK.05Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Grossular9.AD.25Ca3Al2(SiO4)3
Lizardite9.ED.15Mg3(Si2O5)(OH)4
Magnesio-hornblende9.DE.10☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
'Nimite'9.EC.55(Ni,Mg,Al)6((Si,Al)4O10)(OH)8
'Omphacite'9.DA.20(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6
'Pargasite'9.DE.15{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
'Prehnite'9.DP.20Ca2Al2Si3O10(OH)2
'Talc'9.EC.05Mg3Si4O10(OH)2
Titanite9.AG.15CaTi(SiO4)O
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Vesuvianite9.BG.35(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Xonotlite9.DG.35Ca6(Si6O17)(OH)2
Zoisite9.BG.10{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
var: Thulite9.BG.10{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Biotite' ?-
Deweylite-Mg4Si3O10 · 6H2O ?
Fayalite-Forsterite Series-
Grossular-Hibschite Series-
Limonite-(Fe,O,OH,H2O)
'Manganese Oxides'-
'var: Manganese Dendrites'-
Tourmaline-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Platinum Group Metals and Alloys
Palladium ?1.2.1.4(Pd,Pt)
Platinum ?1.2.1.1Pt
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
AmBnXp, with (m+n):p = 9:8
Pentlandite2.7.1.1(FexNiy)Σ9S8
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Millerite2.8.16.1NiS
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Hydroxysulfides and Hydrated Sulfides
Tochilinite2.14.2.1Fe2+5-6(Mg,Fe2+)5S6(OH)10
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Rutile4.4.1.1TiO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
X(OH)2
Brucite6.2.1.1Mg(OH)2
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Magnesite14.1.1.2MgCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Miscellaneous
Huntite14.4.3.1CaMg3(CO3)4
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Azurite16a.2.1.1Cu3(CO3)2(OH)2
Malachite16a.3.1.1Cu2(CO3)(OH)2
Mcguinnessite16a.3.1.4(Mg,Cu)2(CO3)(OH)2
Pokrovskite16a.3.1.5Mg2(CO3)(OH)2
Group 16b - HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
Desautelsite16b.6.2.4Mg6Mn3+2(OH)16[CO3] · 4H2O
Coalingite16b.7.6.1Mg10Fe3+2(OH)24[CO3] · 2H2O
Hydromagnesite16b.7.1.1Mg5(CO3)4(OH)2 · 4H2O
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)m(XO4)pZq, where m:p>2:1
Brochantite30.1.3.1Cu4(SO4)(OH)6
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Grossular51.4.3b.2Ca3Al2(SiO4)3
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Clinozoisite58.2.1a.4{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Vesuvianite58.2.4.1(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Zoisite58.2.1b.1{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with borate groups
Dravite61.3.1.9Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Omphacite65.1.3b.1(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Anthophyllite66.1.2.1☐{Mg2}{Mg5}(Si8O22)(OH)2
Pargasite66.1.3a.12{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
Tremolite66.1.3a.1☐{Ca2}{Mg5}(Si8O22)(OH)2
Amphiboles - Ca-Na subgroup
Xonotlite66.3.1.1Ca6(Si6O17)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Antigorite71.1.2a.1Mg3(Si2O5)(OH)4
Chrysotile71.1.5.1Mg3(Si2O5)(OH)4
Lizardite71.1.2b.2Mg3(Si2O5)(OH)4
Sheets of 6-membered rings with 2:1 layers
Talc71.2.1.3Mg3Si4O10(OH)2
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Nimite71.4.1.5(Ni,Mg,Al)6((Si,Al)4O10)(OH)8
Group 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
Prehnite72.1.3.1Ca2Al2Si3O10(OH)2
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla ?74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Unclassified Minerals, Rocks, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
'Albite-Anorthite Series'-
Aragonite-CaCO3
'Biotite' ?-
'Deweylite'-Mg4Si3O10 · 6H2O ?
Diopside
var: Chromian Diopside
-Ca(Mg,Cr)Si2O6
'Fayalite-Forsterite Series'-
'Grossular-Hibschite Series'-
'Limonite'-(Fe,O,OH,H2O)
Magnesio-hornblende-☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
'Manganese Oxides'-
'var: Manganese Dendrites'-
Quartz
var: Chalcedony
-SiO2
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z
Zoisite
var: Thulite
-{Ca2}{Al3}(Si2O7)(SiO4)O(OH)

List of minerals for each chemical element

HHydrogen
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2
H AntigoriteMg3(Si2O5)(OH)4
H AzuriteCu3(CO3)2(OH)2
H BrochantiteCu4(SO4)(OH)6
H BruciteMg(OH)2
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H ChrysotileMg3(Si2O5)(OH)4
H ClinochloreMg5Al(AlSi3O10)(OH)8
H Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
H CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
H DesautelsiteMg6Mn23+(OH)16[CO3] · 4H2O
H DeweyliteMg4Si3O10 · 6H2O ?
H DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Goethiteα-Fe3+O(OH)
H HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
H Limonite(Fe,O,OH,H2O)
H LizarditeMg3(Si2O5)(OH)4
H Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
H MalachiteCu2(CO3)(OH)2
H Mcguinnessite(Mg,Cu)2(CO3)(OH)2
H Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8
H OpalSiO2 · nH2O
H Pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
H PokrovskiteMg2(CO3)(OH)2
H PrehniteCa2Al2Si3O10(OH)2
H TalcMg3Si4O10(OH)2
H Zoisite (var: Thulite){Ca2}{Al3}(Si2O7)(SiO4)O(OH)
H TochiliniteFe2+5-6(Mg,Fe2+)5S6(OH)10
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
H Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
H XonotliteCa6(Si6O17)(OH)2
H Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
BBoron
B DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
B Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
CCarbon
C AragoniteCaCO3
C AzuriteCu3(CO3)2(OH)2
C CalciteCaCO3
C CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
C DesautelsiteMg6Mn23+(OH)16[CO3] · 4H2O
C DolomiteCaMg(CO3)2
C HuntiteCaMg3(CO3)4
C HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
C MagnesiteMgCO3
C MalachiteCu2(CO3)(OH)2
C Mcguinnessite(Mg,Cu)2(CO3)(OH)2
C PokrovskiteMg2(CO3)(OH)2
OOxygen
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O AlbiteNa(AlSi3O8)
O Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2
O AntigoriteMg3(Si2O5)(OH)4
O AragoniteCaCO3
O AzuriteCu3(CO3)2(OH)2
O BrochantiteCu4(SO4)(OH)6
O BruciteMg(OH)2
O CalciteCaCO3
O Quartz (var: Chalcedony)SiO2
O Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
O ChromiteFe2+Cr23+O4
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O ChrysotileMg3(Si2O5)(OH)4
O ClinochloreMg5Al(AlSi3O10)(OH)8
O Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
O CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
O DesautelsiteMg6Mn23+(OH)16[CO3] · 4H2O
O DeweyliteMg4Si3O10 · 6H2O ?
O DiopsideCaMgSi2O6
O DolomiteCaMg(CO3)2
O DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O FluorapatiteCa5(PO4)3F
O Goethiteα-Fe3+O(OH)
O GrossularCa3Al2(SiO4)3
O HematiteFe2O3
O HuntiteCaMg3(CO3)4
O HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
O IlmeniteFe2+TiO3
O Limonite(Fe,O,OH,H2O)
O LizarditeMg3(Si2O5)(OH)4
O Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
O MagnesiteMgCO3
O MagnetiteFe2+Fe23+O4
O MalachiteCu2(CO3)(OH)2
O Mcguinnessite(Mg,Cu)2(CO3)(OH)2
O Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8
O Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
O OpalSiO2 · nH2O
O Pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
O PokrovskiteMg2(CO3)(OH)2
O PrehniteCa2Al2Si3O10(OH)2
O QuartzSiO2
O RutileTiO2
O TalcMg3Si4O10(OH)2
O Zoisite (var: Thulite){Ca2}{Al3}(Si2O7)(SiO4)O(OH)
O TitaniteCaTi(SiO4)O
O TochiliniteFe2+5-6(Mg,Fe2+)5S6(OH)10
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
O Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
O XonotliteCa6(Si6O17)(OH)2
O Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
FFluorine
F FluorapatiteCa5(PO4)3F
F Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
NaSodium
Na AlbiteNa(AlSi3O8)
Na DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Na Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Na Pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
Na Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
MgMagnesium
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Mg Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2
Mg AntigoriteMg3(Si2O5)(OH)4
Mg BruciteMg(OH)2
Mg Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Mg ChrysotileMg3(Si2O5)(OH)4
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
Mg CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
Mg DesautelsiteMg6Mn23+(OH)16[CO3] · 4H2O
Mg DeweyliteMg4Si3O10 · 6H2O ?
Mg DiopsideCaMgSi2O6
Mg DolomiteCaMg(CO3)2
Mg DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Mg HuntiteCaMg3(CO3)4
Mg HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
Mg LizarditeMg3(Si2O5)(OH)4
Mg Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Mg MagnesiteMgCO3
Mg Mcguinnessite(Mg,Cu)2(CO3)(OH)2
Mg Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8
Mg Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Mg Pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
Mg PokrovskiteMg2(CO3)(OH)2
Mg TalcMg3Si4O10(OH)2
Mg TochiliniteFe2+5-6(Mg,Fe2+)5S6(OH)10
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Mg Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
AlAluminium
Al AlbiteNa(AlSi3O8)
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Al DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al GrossularCa3Al2(SiO4)3
Al Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Al Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8
Al Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Al Pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
Al PrehniteCa2Al2Si3O10(OH)2
Al Zoisite (var: Thulite){Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Al Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Al Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
SiSilicon
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si AlbiteNa(AlSi3O8)
Si Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2
Si AntigoriteMg3(Si2O5)(OH)4
Si Quartz (var: Chalcedony)SiO2
Si Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si ChrysotileMg3(Si2O5)(OH)4
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Si DeweyliteMg4Si3O10 · 6H2O ?
Si DiopsideCaMgSi2O6
Si DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si GrossularCa3Al2(SiO4)3
Si LizarditeMg3(Si2O5)(OH)4
Si Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Si Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8
Si Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Si OpalSiO2 · nH2O
Si Pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
Si PrehniteCa2Al2Si3O10(OH)2
Si QuartzSiO2
Si TalcMg3Si4O10(OH)2
Si Zoisite (var: Thulite){Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Si TitaniteCaTi(SiO4)O
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Si Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Si XonotliteCa6(Si6O17)(OH)2
Si Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
PPhosphorus
P FluorapatiteCa5(PO4)3F
SSulfur
S BorniteCu5FeS4
S BrochantiteCu4(SO4)(OH)6
S ChalcociteCu2S
S ChalcopyriteCuFeS2
S GalenaPbS
S MilleriteNiS
S MolybdeniteMoS2
S Pentlandite(FexNiy)Σ9S8
S PyriteFeS2
S PyrrhotiteFe7S8
S TochiliniteFe2+5-6(Mg,Fe2+)5S6(OH)10
CaCalcium
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca AragoniteCaCO3
Ca CalciteCaCO3
Ca Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Ca Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Ca DiopsideCaMgSi2O6
Ca DolomiteCaMg(CO3)2
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca FluorapatiteCa5(PO4)3F
Ca GrossularCa3Al2(SiO4)3
Ca HuntiteCaMg3(CO3)4
Ca Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Ca Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Ca Pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
Ca PrehniteCa2Al2Si3O10(OH)2
Ca Zoisite (var: Thulite){Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Ca TitaniteCaTi(SiO4)O
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Ca Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Ca XonotliteCa6(Si6O17)(OH)2
Ca Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
TiTitanium
Ti IlmeniteFe2+TiO3
Ti RutileTiO2
Ti TitaniteCaTi(SiO4)O
CrChromium
Cr Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Cr ChromiteFe2+Cr23+O4
MnManganese
Mn DesautelsiteMg6Mn23+(OH)16[CO3] · 4H2O
FeIron
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe BorniteCu5FeS4
Fe ChalcopyriteCuFeS2
Fe ChromiteFe2+Cr23+O4
Fe CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
Fe IlmeniteFe2+TiO3
Fe Limonite(Fe,O,OH,H2O)
Fe MagnetiteFe2+Fe23+O4
Fe Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Fe Pentlandite(FexNiy)Σ9S8
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
Fe TochiliniteFe2+5-6(Mg,Fe2+)5S6(OH)10
Fe Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
NiNickel
Ni MilleriteNiS
Ni Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8
Ni Pentlandite(FexNiy)Σ9S8
CuCopper
Cu AzuriteCu3(CO3)2(OH)2
Cu BorniteCu5FeS4
Cu BrochantiteCu4(SO4)(OH)6
Cu ChalcociteCu2S
Cu ChalcopyriteCuFeS2
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu MalachiteCu2(CO3)(OH)2
Cu Mcguinnessite(Mg,Cu)2(CO3)(OH)2
MoMolybdenum
Mo MolybdeniteMoS2
PdPalladium
Pd Palladium(Pd,Pt)
PtPlatinum
Pt PlatinumPt
PbLead
Pb GalenaPbS

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Cambrian - Neoproterozoic
485.4 - 1000 Ma



ID: 3190533
Precambrian-Phanerozoic sedimentary and volcanic rocks

Age: Neoproterozoic to Cambrian (485.4 - 1000 Ma)

Lithology: Metasedimentary/metavolcanic schist

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Early Cambrian - Neoproterozoic
511 - 1000 Ma



ID: 2457850
phyllonite

Age: Neoproterozoic to Cambrian (511 - 1000 Ma)

Comments: green gray; thin bedded; Dominant phyllonitic folation; No fossils; mica; sheared schist, metagraywacke, and migmatite

Lithology: Vein quartz

Reference: Davis, A.M., C.S. Southworth, J.E. Reddy, J.S. Schindler. Geologic Map Database of the Washington DC Area Featuring Data from Three 30 x 60 Minute Quadrangles: Frederick, Washington West, and Fredericksburg. U.S. Geological Survey Open-File Report 01-227. [69]

Proterozoic
541 - 2500 Ma



ID: 2928263
Wissahickon Formation (Undivided)

Age: Proterozoic (541 - 2500 Ma)

Stratigraphic Name: Wissahickon Formation

Description: Muscovite-chlorite-albite schist, muscovite-chlorite schist, chloritoid schist, and quartzite; intensely folded and cleaved.

Comments: Original map source: In 1995 the Water Resources Division of the U.S. Geological Survey digitized the geologic map of Maryland from the 1968 paper map (Reference MD001). Information about products from the Maryland Geological Survey can be found at http://www.mgs.md.gov/.

Lithology: Major:{muscovite schist}, Minor:{quartzite}, Incidental:{schist}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Griesbach, John (1956) Rockville Crushed Stone Quarry: Rocks and Minerals: 31: 351-353.
Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p.
Parker, F. (2005), The Minerals of the Hunting Hill Quarry, Rockville, Maryland; Mineralogical Record 36 (5): 435-446.


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