Bultfonteinite

Bultfonteinite
Bultfonteinite from Shijiangshan mine, China
General
CategoryNesosilicates
Formula
(repeating unit)
Ca2SiO2(OH,F)4
IMA symbolBul[1]
Strunz classification9.AG.80[2]
Dana classification52.4.7.2[2]
Crystal systemTriclinic
Crystal classPinacoidal (1)
(same H-M symbol)
Space groupP1
Unit cella = 10.99 Å, b = 8.18 Å
c = 5.67 Å, α = 93.95°
β = 91.32°, γ = 89.85°;[2] Z = 4
Identification
ColorColorless, pink, light brown
TwinningInterpenetrating on {100} and {010}; polysynthetic
CleavageGood on {100} and {010}
FractureConchoidal
Mohs scale hardness4.5
LusterVitreous
StreakWhite[2]
DiaphaneityTransparent
Optical propertiesBiaxial (+)
Refractive indexnα = 1.587
nβ = 1.590
nγ = 1.597[2]
Birefringenceδ = 0.010[2]
2V angle70° (measured)
Dispersionr > v; barely perceptible
SolubilitySoluble in hydrochloric acid[3]
References[4]

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.

  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.
  2. ^ a b c d e f "Bultfonteinite". Mindat. Archived from the original on November 14, 2009. Retrieved July 19, 2012.
  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.
  4. ^ "Bultfonteinite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Archived (PDF) from the original on August 1, 2012. Retrieved July 19, 2012.