Mineral - Bahianite
Bahianite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
Al₅Sb₃O₁₄(OH)₂
Unit Cell
a=9.40 b=11.54 c=4.41 β=91° Z=2
Physical Properties
Hardness
9
Streak
white
Density
Heavy (3,5-6)
Cleavage
Perfect after {100}
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
blackbrownorangeyellow
Birefringence
0.110
Luster
Adamantine
Transparency
translucent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
granular, spherical
Formation
In a placer deposit from an altered volcanite
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Bahianite
Composition
Elements
Mass
WO₃
1.20
Sb₂O₅
57.28
SiO₂
1.03
Al₂O₃
35.37
Fe₂O₃
1.04
BeO
0.75
H₂O
2.77
Brazil (Moore et al. 1978)
Name and first discovery: Named after the type locality in the state of Bahia, Brazil.
Chemism:
Synonyms:
Varieties:
Abbreviation: Bhi
Famous sites
(TL) Type locality (analysis) Chemical element distribution, see above
Brazil
(TL) (Analysis) Pico das Almas river, Paramirim das Crioulas, Bahia, Brazil
Literature
Moore, P. B., do Prado Barbosa, C., & Gaines, R. V. (1978). Bahianite, Sb3Al5O14 (OH) 2, a new species. MineralogicalMagazine, 42(322), 179-182.