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Minerals - Holtite | TerraCollect
Mineral - Holtite
Holtite
(Ta₀,6 □0,4)Al₆BSi₃O₁₈(O,OH)₂,25
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
(Ta₀,6 □0,4)Al₆BSi₃O₁₈(O,OH)₂,25
Unit Cell
Physical Properties
Hardness
1 - 10
Streak
brown
yellow
yellow brown
Optical Properties
Color
white
brown
pink
violet
Birefringence
Luster
Vitreous,
Resinous
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
Density
Cleavage
Fracture
Tenacity
orthorhombic
Point Group
Space Group
Habit
acicular,
prismatic,
prismatic,
tabular
Formation
Aus Tantalit in Pegmatiten, alluvial
Paragenesis
Twinning
Rarity
Synonyms
Holtite
