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Ferroan Saponite

Colour:Dark greenHardness: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

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Physical Properties of Ferroan Saponite

Lustre: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
Maximum Birefringence:δ = 0.087

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:none

Other Names for Ferroan Saponite

Synonyms:
Griffithite
Other Languages:
German:Griffithit
Spanish:Griffithita

Other Information

Health Warning: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

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    Localities for Ferroan Saponite

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    The 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. ? 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
          • Boron
            • Kramer Borate deposit
              • U.S. Borax Mine (Pacific West Coast Borax Mine; Pacific Coast Borax Co. Mine; Boron Mine; U.S. Borax and Chemical Corp. Mine; Kramer Mine; Baker Mine)
                • Baker mine
    		Tschernich, R. (1992): Zeolites of the World, 64, 311
      • Los Angeles Co.
          • 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.
          • Los Angeles
            • Griffith Park
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 12th Oct 2009 20:42:48