Cacoxenite

Formula:  (Fe,Al)25(PO4)17O6(OH)12 . 75H2O

Origin of name:  From Greek for bad guest, as phosphorus is a bad guest in iron

 

Crystal system:  Hexagonal

Crystal class:  6/m

Twinning:

Unit cell: a = 27.6 Ǻ, c = 10.4 Ǻ

 

Colour:  golden yellow, yellow, brownish yellow, reddish yellow

Diaphaneity:

Luster:

Habit:  Crystals minute, acicular, as radiating tufted aggregates, crusts

Hardness:  3 to 4

Specific gravity:  2.26

Cleavage:  None

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:

 

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