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Wollastonite

Chem_Physical_Properties

A naturally occurring, calcium metasilicate (CaSiO3), white, non-metallic mineral with an acicular particle shape.

Wollastonite’s unique chemistry and acicular (needle-shaped) physical structure make it one of the world’s most versatile and effective value-added performance materials.

CHEMICAL COMPOSITION
COMPONENT Lewis Mine, New York Typical Value (%) Pilares Mine, Mexico Typical Value Wet Process (%) Pilares Mine, Mexico Typical Value Dry Process (%)
CaO 46.36 44.94 45.72
SiO2 51.60 52.94 46.52
Fe2O3 0.77 0.28 0.25
Al2O3 0.40 0.30 0.25
MnO 0.15 0.04 0.02
MgO 0.15 0.75 0.71
TiO2 0.05 0.05 0.05
K2O 0.02 0.23 0.20
Wt. Loss (1000˙C) 0.50 0.47 6.30
TYPICAL PROPERTIES VALUE
APPEARANCE WHITE
MORPHOLOGY ACICULAR
MOLECULAR WEIGHT 116
SPECIFIC GRAVITY 2.9
REFRACTIVE INDEX 1.63
pH (10% SLURRY) 9.9
WATER SOLUBILITY (g/100cc) 0.0095
DENSITY (lbs./cu.ft.) 181
BULKING VALUE (gal./lbs.) 0.0413
MOHS HARDNESS 4.5
COEFFICIENT OF EXPANSION (mm/mm/˙C) 6.5 X 10-6
MELTING POINT (˙C) – theoretical MELTING POINT (˙C) – by ASTM D1857 1540 1410