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Ferroan Saponite

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Formula:
Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Colour:
Dark green
Lustre:
Vitreous, Dull
Hardness:
1
A variety of Saponite

Originally reported from Santa Monica Mts, Los Angeles Co., California, USA.

See also the Fe-dominant end-member ferrosaponite.




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Physical Properties of Ferroan SaponiteHide

Vitreous, Dull
Colour:
Dark green
Streak:
Green
Hardness:

Optical Data of Ferroan SaponiteHide

Type:
Biaxial (-)
RI values:
nα = 1.485 nβ = 1.565 nγ = 1.572
Max Birefringence:
δ = 0.087
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
none

Chemical Properties of Ferroan SaponiteHide

Formula:
Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O

Synonyms of Ferroan SaponiteHide

Other Language Names for Ferroan SaponiteHide

German:Griffithit
Spanish:Griffithita

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ferroan SaponiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Larsen, E.S. & G. Steiger (1917), Mineralogical notes: griffithite, a new member of the chlorite group, Washington Acad. Sci. Jour.: 7: 6-12.
Larsen, Esper Signius & George Steiger (1928), Dehydration and optical studies of alunogen, nontronite, and griffithite: Am. Jour. Sci., 5th. series: 15: 1-19.

Internet Links for Ferroan SaponiteHide

Localities for Ferroan SaponiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
India
 
  • Maharashtra
    • Latur District
AmMin 88:1983–1988, (2003)
USA
 
  • California
    • Kern Co.
      • Kramer District (Kramer Borate District)
        • Boron
          • Kramer Borate deposit
Wise, W. S., & Kleck, W. D. (1988). Sodic clay-zeolite assemblage in basalt at Boron, California. Clays and Clay Minerals, 36(2), 131-136.
Tschernich, R. (1992): Zeolites of the World, 64, 311; Clays and Clay Minerals, Vol. 36, No. 2, 131-136, 1988.
    • Los Angeles Co.
      • Santa Monica Mts
        • Los Angeles
          • Hollywood Hills
            • Hollywood
              • Brush Canyon
Neuerberg, George J., (1951), Minerals of the Neuerberg, George Joseph (1951), Minerals of the eastern Santa Monica Mountains, Los Angeles city: American Mineralogist: 36: 136; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 208; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 440.; Neuerberg, George Joseph (1951), Minerals of the eastern Santa Monica Mountains, Los Angeles city: American Mineralogist: 36: 156-160.
              • Cahuenga Pass
Neuerberg, George Joseph (1951), Minerals of the eastern Santa Monica Mountains, Los Angeles city: American Mineralogist: 36: 156-160.
Neuerberg, George Joseph (1951), Minerals of the eastern Santa Monica Mountains, Los Angeles city: American Mineralogist: 36: 156-160; Sharp, W.E. (1959) Minerals from Los Angeles County, California. Printed privately, Los Angeles, California: 17, 84; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 440.
Larsen, Esper Signius & George Steiger (1917), Mineralogical notes; griffithite, a new member of the chlorite group: Washington Academy of Science Journal: 7: 6-12; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 208.
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