avogadrite
Sign in to saveAvogadrite ((K,Cs)BF4) is a potassium-caesium tetrafluoroborate in the halide class. Avogadrite crystallizes in the orthorhombic system (space group Pnma) with cell parameters a 8.66 Å, b 5.48 Å and c Å 7.03.
Key facts
- Mineral.name
- Avogadrite
- Mineral.category
- Halide mineral
- Mineral.image
- Ferruccite, Avogadrite - Vesuvius, Italia.jpg
- Mineral.caption
- Ferruccite (white) on avogadrite (yellow-brownish), picture size: 5 mm
- Mineral.formula
- (K,Cs)BF4
- Mineral.IMAsymbol
- Avg
- Mineral.strunz
- 3.CA.10
- Mineral.system
- Orthorhombic
- Mineral.class
- Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
- Mineral.symmetry
- Pnma
- Mineral.unit cell
- a = 8.6588, b = 5.48 c = 7.0299 [Å]; Z = 4
- Mineral.color
- Colorless to white, yellowish to reddish
- Mineral.habit
- Tabular to platy octagonal crystals, tiny crystals, elongate
- Mineral.luster
- Vitreous, greasy
- Mineral.refractive
- nα = 1.3239, nβ = 1.3245, nγ = 1.3247
- Mineral.opticalprop
- Biaxial (-)
- Mineral.birefringence
- δ = 0.001
- Mineral.2V
- 75°(meas), 58° (calc)
via Wikipedia infobox
~1 min read
Encyclopedic overview
3 sectionsContents
- History
- Bibliography
- References
Avogadrite ((K,Cs)BF4) is a potassium-caesium tetrafluoroborate in the halide class. Avogadrite crystallizes in the orthorhombic system (space group Pnma) with cell parameters a 8.66 Å, b 5.48 Å and c Å 7.03.
==History==
Excerpted from Wikipedia’s “avogadrite” article, available under the CC BY-SA 4.0 licence.