Formula: SrB2Si2O8
Origin of name: after Russian mineralogist Igor Pekov (1967-), expert on mineralogy of alkaline rocks
Crystal system: Orthorhombic
Crystal class:
Twinning:
Unit cell: a = 8.155, b = 7.919, c = 8.921
Colour: White to colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit: Anhedral equant grains
Hardness: 7
Specific gravity: 3.35
Cleavage: None
Tenacity: Brittle, uneven fracture
Streak: White
Synonyms/varieties:
Comments: Sr analogue of danburite
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