Hambergite
(repeating unit)Be2BO3OH IMA symbol Hb[1] Strunz classification 6.AB.05 Crystal system Orthorhombic Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) Space group Pbca Unit cell a = 9.76, b = 12.20
c = 4.43 [Å]; Z = 8 Identification Color Colorless, pale gray, pale yellow Crystal habit Prismatic crystals Twinning On {110} Cleavage Perfect on {010}, good on {100} Tenacity Brittle Mohs scale hardness 7.5 Luster Vitreous Streak White Diaphaneity Transparent to translucent Specific gravity 2.347–2.372 Optical properties Biaxial (+) Refractive index nα = 1.554 – 1.560 nβ = 1.587 – 1.591 nγ = 1.628 – 1.631 Birefringence δ = 0.074 Pleochroism Colorless 2V angle 87° Solubility Soluble in HF (Hydrogen fluoride) References [2][3][4]
H-M symbol: (2/m 2/m 2/m)
c = 4.43 [Å]; Z = 8
Hambergite (Be2BO3OH) is a beryllium borate mineral named after Swedish explorer and mineralogist Axel Hamberg (1863–1933). The mineral occurs as white or colorless orthorhombic crystals.[3][4][2]
Occurrence
Hambergite occurs in beryllium bearing granite pegmatites as a rare accessory phase. It occurs associated with beryl, danburite, apatite, spodumene, zircon, fluorite, feldspar and quartz.[2]
It was first described by mineralogist and geographer W. C. Brøgger in 1890.[5] The type locality is Salbutangen, Helgeroa, Langesundsfjorden, Larvik, Vestfold, Norway where it was found in a pegmatite dike of nepheline syenite composition.[3][6]
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.
- ^ a b c "Hambergite" (PDF). Mineral Data Publishing. Retrieved 6 January 2012.
- ^ a b c "Hambergite". mindat.org. Retrieved 6 January 2012.
- ^ a b "Hambergite Mineral Data". Retrieved 6 January 2012.
- ^ Godal, Anne Marit (ed.). "hambergitt". Store norske leksikon (in Norwegian). Norsk nettleksikon. Retrieved 6 January 2012.
- ^ Mindat location data
Bibliography
- Palache, P.; Berman H.; Frondel, C. (1960). "Dana's System of Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. (Seventh Edition)" John Wiley and Sons, Inc., New York, pp. 370–372.
- G. Diego Gatta; Garry J. McIntyre; Geoffrey Bromiley; Alessandro Guastoni; Fabrizio Nestola American Mineralogist (2012) 97 (11–12): 1891–1897. https://doi.org/10.2138/am.2012.4232
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