VS
Name
—
Ca₂B₅O₉Cl·H₂O
Formula
—
Mineral Species
Entry type
—
Borates
Chemical class
—
Triclinic
Crystal system
—
5
Mohs hardness
—
2.67–2.71
Specific gravity
—
White
Streak
—
Vitreous
Luster
—
On {010}, perfect; on {100}, good
Cleavage
—
P1
Space group
—
Hilgardite
Structural group
—
Hgr · Grandfathered
IMA
—
1937
Named in
—
Colorless, slightly reddish brown; colorless in transmitted light
Typical colors
—
Ca · B · O · Cl · H
Elements
—