VS
Name
—
Ca₂ThSi₈O₂₀
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Tetragonal
Crystal system
—
4.5–5
Mohs hardness
—
2.95–3.28
Specific gravity
—
White
Streak
—
Vitreous
Luster
—
Distinct on {101}, indistinct on {001}
Cleavage
—
P4/mcc
Space group
—
Amorphous
Structural group
—
Ek · Approved
IMA
—
1961
Named in
—
Colorless, light to dark green, yellow-green to yellowish brown, straw-yellow, red from inclusions
Typical colors
—
Ca · Th · Si · O
Elements
—