Formula: (Ca,Ce)4(Na,Ca)3Ti(Si2O7)2(O,F)4
Origin of name: for H. Rink, Danish official
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 5.679, b = 7.412, c = 18.835, β = 102.26°
Colour: reddish brown, yellow, yellowish green
Diaphaneity: Transparent to translucent
Luster: vitreous on fractures, resinous to greasy
Habit: crystals prismatic, faces striated, massive
Hardness: 4 to 5
Specific gravity: 3.18 to 3.44
Cleavage: 1; {100} distinct
Tenacity:
Streak: pale yellow, gray brown, white
Synonyms/varieties: Rinkolite
Comments: may be identical to mosandrite
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