Chemistry:Hambergite
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| Hambergite | |
|---|---|
 2.3 × 1.1 × 1 cm crystal of hambergite on albite from Paprok, Nuristan Province, Afghanistan | |
| General | |
| Category | Borate mineral |
| Formula (repeating unit) | Be2BO3OH |
| 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 |
| |re|er}} | 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 | [1][2][3] |
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.[2][3][1]
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.[1]
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.[2][6]
References
- ↑ 1.0 1.1 1.2 "Hambergite". Mineral Data Publishing. http://www.handbookofmineralogy.com/pdfs/hambergite.pdf. Retrieved 6 January 2012.
- ↑ 2.0 2.1 2.2 "Hambergite". mindat.org. http://www.mindat.org/min-1811.html. Retrieved 6 January 2012.
- ↑ 3.0 3.1 "Hambergite Mineral Data". http://www.webmineral.com/data/Hambergite.shtml. Retrieved 6 January 2012.
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
- ↑ Godal, Anne Marit, ed. "hambergitt" (in Norwegian). Store norske leksikon. Norsk nettleksikon. http://www.snl.no/hambergitt. 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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