VS
Name
—
(Ca₃REE)Na(NaCa)Ti(Si₂O₇)₂(OF)F₂
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
4–5
Mohs hardness
—
3.18–3.44
Specific gravity
—
Pale yellow, grayish brown, white
Streak
—
Vitreous on fractures, resinous to greasy on cleavages
Luster
—
Distinct on {100}
Cleavage
—
—
Space group
—
Seidozerite-Rinkite
Structural group
—
Rin-Ce · Approved
IMA
—
1884
Named in
—
Reddish brown; alters to dull greenish or yellowish brown; bright red in transmitted light
Typical colors
—
Ca · REE · Na · Ti · Si · O · F
Elements
—