Mineral - Roweite
Roweite
Chemical Properties
Mineral Class
Borates
Toxicity
none
Formula
Ca₂Mn²⁺₂B₄O₇(OH)₆
Unit Cell
a=8.28 b=13.36 c=9.06 Z=4
Physical Properties
Hardness
5
Streak
whitebrownbrown white
Density
Normal (2-3,5)
Cleavage
Imperfect after {100}
Fracture
conchoidal
Tenacity
Brittle
Optical Properties
Color
brown
Birefringence
0.015
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
orthorhombic-dipyramidal - 2/m 2/m 2/m
Space Group
Pbam (55)
Habit
leafy, rosette, tabular
Formation
Secondarily, through hydrothermal metasomatism in boron-rich, iron-bearing skarn deposits
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Roweite
Composition
Elements
Mass
B₂O₃
32.40
MnO
28.30
ZnO
3.13
MgO
1.66
CaO
25.40
H₂O
8.51
New Jersey (Palache et al. 1952)