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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.




Classification of Ferroan Saponite

Physical Properties of Ferroan Saponite

Vitreous, Dull
Colour:
Dark green
Streak:
Green
Hardness (Mohs):
1

Optical Data of Ferroan Saponite

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 Saponite

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

Other Names for Ferroan Saponite

Name in Other Languages:
German:Griffithit
Spanish:Griffithita

Other Information

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 Saponite

Reference List:
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 Saponite

mindat.org URL:
https://www.mindat.org/min-6980.html
Please feel free to link to this page.

Localities for Ferroan Saponite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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.
Mineral and/or Locality  
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