Formula: NaCa3(CO3)2F3·H2O
Origin of name: Named for George M. Sheldrick, creator of the SHELX software, widely used for the refinement of crystal structures.
Crystal system: Trigonal
Crystal class: 3
Twinning:
Unit cell: a = 6.718, c = 15.05
Colour: Colourless, white
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Blocky, aggregates
Hardness: 3
Specific gravity: 2.86
Cleavage: [001] good
Tenacity: Brittle
Streak: White
Synonyms/varieties:
Comments:
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