VS
Name
—
Fe²⁺Ta₂O₆
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Orthorhombic
Crystal system
—
6–6.5
Mohs hardness
—
6.65–7.95
Specific gravity
—
Black
Streak
—
Submetallic to vitreous
Luster
—
{100}, distinct; {010}, less distinct
Cleavage
—
—
Space group
—
Columbite
Structural group
—
Ttl-Fe · Approved
IMA
—
1836
Named in
—
Iron-black; reddish brown in transmitted light
Typical colors
—
Fe · Ta · O
Elements
—