Veatchite
(repeating unit)Sr2B11O16(OH)5 · H2O IMA symbol Vea[1] Strunz classification 6.EC.15 Crystal system Monoclinic Crystal class Domatic (m)
(same H-M symbol) Space group Aa Unit cell a = 20.81 Å, b = 11.74 Å
c = 6.63 Å; β = 92.03°; Z = 8 Identification Color Colorless to white Crystal habit Flattened platey to prismatic crystals, diverging fibrous clusters and cross fiber veinlets Cleavage Perfect on {010}, indistinct on {001} Mohs scale hardness 2 Luster Vitreous to pearly Diaphaneity Transparent to translucent Specific gravity 2.62 Optical properties Biaxial (+) Refractive index nα = 1.551 nβ = 1.553 nγ = 1.620 Birefringence δ = 0.069 2V angle Measured: 37° References [2][3][4]
(same H-M symbol)
c = 6.63 Å; β = 92.03°; Z = 8
Veatchite is an unusual strontium borate, with the chemical formula Sr2B11O16(OH)5·H2O. There are two known polytypes, veatchite-A and veatchite-p.[5]
Veatchite was discovered in 1938, at the Sterling Borax mine in Tick Canyon, Los Angeles County, California. Veatchite is named to honor John Veatch, the first person to detect boron in the mineral waters of California.
See also
Earth sciences portal
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Veatchite on Mindat.org
- ^ Veatchite data on Webmineral
- ^ Veatchite in the Handbook of Mineralogy
- ^ Grice J D, Pring A (2012) Veatchite: structural relationships of the three polytypes, American Mineralogist 97, 489-495
External links
Media related to Veatchite at Wikimedia Commons
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