Hambergite | |
---|---|
General | |
Category | Borate mineral |
Formula (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] |
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]
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]
Hambergite | |
---|---|
General | |
Category | Borate mineral |
Formula (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] |
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]
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]