Mineral description : Beryl

Beryl from Ytterklippen.
Beryl from Ytterklippen.
Beryl in microcline from Selsvitberget.
Beryl in microcline from Selsvitberget.

Mineral class Silicates : Cyclosilicates : Beryl Tourmaline group
Chemical formula Al2Be3(Si6O18)
Crystal system Hexagonal.
Habitus Hexagonal prisms, often with flat terminations. Sometimes also massive.
Cleavage Indistinct, uneven to conchoidal fracture.
Hardness 7.5-8
Density 2.65-2.90
Color Grayish whit, yellowish to greenish. Rarely as blue, pink, yellow, green and red.
Streak White.
Luster Vitreous to dull, transparent to translucent.
Description  
Occurance In pegmatites or granites. Also in greisen occurances and some metamorphic schists.
Associates Tourmaline, Chrysoberyl in rocks poor in quartz.
Notes Fuses with difficulty, roundening the edges of small fragments.
Precious stone varietys of beryl is :
  • Emerald : Green.
  • Morganite : Pink.
  • Heliodor : Yellow.
  • Aquamarine : Blue.
  • Bixbite : Red.
  • Goshenite : Colorless.
Locations A common mineral in a number of pegmatites.
  • Ultevis, Lappland. Commonly in pegmatites in the area.
  • Sörhällan quartz quarry, Råneå, Norrbotten. 2 tons have been mined.
  • Varuträsk, Västerbotten. Up to 20 cm long crystals.
  • Abborselet, Nyhem, Jämtland. As small well developed crystals.
  • Selsvitberget, Bollstabruk, Ångermanland. As up to 2 m long crystals.
  • Hoting quartz quarry, Ångermanland. Nice crystals together with schorl.
  • Högsbo quartz quarry, Göteborg. 3 tons have been mined. Kårarvet and Finnbo, Falun, Dalarna. Crystals up to 20 cm in diameter.
  • Reboda, Guldsmedshyttan, Västmanland. Commonly.
  • Perstorp quartz quarry, Godegård, Östergötland. 55 tons have been mined.
  • Ytterklippen, Bjurholm, Ångermanland. Commonly as well formed crystals in quartz.

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Last changed : 1998-09-07