Mineral - Wardite
Wardite
Chemical Properties
Mineral Class
Phosphates
Toxicity
none
Formula
NaAl₃(PO₄)₂(OH)₄ · 2H₂O
Unit Cell
a=7.03 c=19.04 Z=4
Physical Properties
Hardness
5
Streak
white
Density
Normal (2-3,5)
Cleavage
Perfect after {001}
Fracture
Tenacity
Brittle
Optical Properties
Color
whitegreencolorless
Birefringence
0.010
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
tetragonal
Point Group
tetragonal-trapezohedral - 422
Space Group
P4 1 2 1 2 (92)
Habit
dipyramidal, Octahedron, tabular
Formation
Secondary, in granitic phosphate pegmatites through hydrothermal alteration of amblygonite-montebrasite during the late stage of crystallization
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Wardite
Composition
Elements
Mass
P₂O₅
35.12
Al₂O₃
38.70
FeO
0.26
MgO
0.21
Na₂O
7.51
K₂O
0.16
H₂O
17.88
New Hampshire (Palache et al. 1952)
Groups and Members
Wardite-Group