| Hambergite | |
|---|---|
 2.3 × 1.1 × 1 cm crystal of hambergite on albite from Paprok, Nuristan Province, Afghanistan | |
| General | |
| Category | Borate mineral |
| Formula | Be2BO3OH |
| IMA symbol | Hb1 |
| 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 | 234 |
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.342
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.36
References
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.
- "Hambergite" (PDF). Mineral Data Publishing. Archived from the original (PDF) on 15 July 2012. Retrieved 6 January 2012.
- "Hambergite". mindat.org. Retrieved 6 January 2012.
- "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
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