Formula: (Na,Ca,Sr)3(Mn,Fe)2Mn2(VO4)4(OH,O)5.2H2O
Origin of name: for the Atchison, Topeka and Santa Fe Railroad Company
Crystal system: orthorhombic
Crystal class: 222
Twinning:
Unit cell:
Colour: black
Diaphaneity:
Luster: subadamantine
Habit: crystals acicular, rosettes of radiating crystals
Hardness:
Specific gravity: 3.379
Cleavage: 2; {010} perfect, easy, {110} distinct
Tenacity:
Streak: brown
Synonyms/varieties:
Comments:
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