Nikischerite

Formula: NaFe₆Al₃(SO₄)₂(OH)₁₈·12H₂O

Origin of name: for Anthony (Tony) J. Nikischer (1949-), geologist (Excalibur Minerals) who discovered the mineral.

Crystal system: Trigonal

Crystal class: 3

Twinning: 

Unit cell: a = 9.352, c = 33.08

Colour: Green

Diaphaneity: Transparent

Luster: Earthy (dull)

Habit: Micaceous, platy, radial

Hardness: 2

Specific gravity: 2.33

Cleavage: 1; (001) perfect

Tenacity: Friable

Streak: Pale grayish green

Synonyms/varieties:

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