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Minerals - Howlite | TerraCollect
Mineral - Howlite
Howlite
Ca₂[B₃O₄(OH)₂ · OSiB₂O₄(OH)₃]
Chemical Properties
Mineral Class
Borates
Toxicity
none
Formula
Ca₂[B₃O₄(OH)₂ · OSiB₂O₄(OH)₃]
Unit Cell
Physical Properties
Hardness
3 - 3.5
Streak
white
Density
Normal (2-3,5)
Optical Properties
Color
white
brown
colorless
Birefringence
Luster
Vitreous
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Cleavage
Fracture
Tenacity
Point Group
Space Group
Habit
bulbous,
massive,
kidney-shaped,
tabular
Formation
hydrothermal
Paragenesis
Twinning
Rarity
Common
Synonyms
Howlite
