Formula: (Fe,Al)24Si4O43(OH)2
Origin of name: For Macaulay Institute for Soil Research, Scotland
Crystal system: Monoclinic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Blood-red
Diaphaneity:
Luster: Earthy
Habit: Subangular platy grains, submicroscopic
Hardness:
Specific gravity: 4.41
Cleavage: 1; probably basal
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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