Bultfonteinite

Bultfonteinite
Bultfonteinite
	Bultfonteinite from Shijiangshan mine, China
General
Category	Nesosilicates
Formula; (repeating unit)	Ca2SiO2(OH,F)4
IMA symbol	Bul
Strunz classification	9.AG.80
Dana classification	52.4.7.2
Crystal system	Triclinic
Crystal class	Pinacoidal (1); (same H-M symbol)
Space group	P1
Unit cell	a = 10.99 Å, b = 8.18 Å; c = 5.67 Å, α = 93.95°; β = 91.32°, γ = 89.85°; Z = 4
Identification
Color	Colorless, pink, light brown
Twinning	Interpenetrating on {100} and {010}; polysynthetic
Cleavage	Good on {100} and {010}
Fracture	Conchoidal
Mohs scale hardness	4.5
Luster	Vitreous
Streak	White
Diaphaneity	Transparent
Optical properties	Biaxial (+)
Refractive index	nα = 1.587; nβ = 1.590; nγ = 1.597
Birefringence	δ = 0.010
2V angle	70° (measured)
Dispersion	r > v; barely perceptible
Solubility	Soluble in hydrochloric acid
References

Bultfonteinite, originally dutoitspanite, is a pink, light-brown or colorless mineral with chemical formula Ca₂SiO₂(OH,F)₄. It was discovered in 1903 or 1904 in the Bultfontein mine in South Africa, for which the mineral is named, and described in 1932.

^ 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.
^ ^a ^b ^c ^d ^e ^f "Bultfonteinite". Mindat. Archived from the original on November 14, 2009. Retrieved July 19, 2012.
^ Foshag, W. F. (January 1933). "New Mineral Names: Bulfonteinite" (PDF). American Mineralogist. 18 (1). Mineralogical Society of America: 32. Archived (PDF) from the original on 2012-07-23. Retrieved 2012-07-19.
^ "Bultfonteinite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Archived (PDF) from the original on August 1, 2012. Retrieved July 19, 2012.

[1] 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.

[mindat-2] ^ ^a ^b ^c ^d ^e ^f "Bultfonteinite". Mindat. Archived from the original on November 14, 2009. Retrieved July 19, 2012.

[newNames-3] Foshag, W. F. (January 1933). "New Mineral Names: Bulfonteinite" (PDF). American Mineralogist. 18 (1). Mineralogical Society of America: 32. Archived (PDF) from the original on 2012-07-23. Retrieved 2012-07-19.

[handbook-4] "Bultfonteinite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Archived (PDF) from the original on August 1, 2012. Retrieved July 19, 2012.

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