Mineral - Howlite
Howlite
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)
Cleavage
Fracture
Tenacity
Optical Properties
Color
whitebrowncolorless
Birefringence
Luster
Vitreous
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
bulbous, massive, kidney-shaped, tabular
Formation
hydrothermal
Paragenesis
Twinning
Rarity
Common
Synonyms
Howlite