Androsite-(La)

Formula:  (Mn,Ca) REE AlMn3+Mn2+(SiO4)(Si2 O7)O(OH)   (REE = La, Ce, Nd)

Origin of name:  After locality; Andros Island, Cyclades, Greece

 

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: a = 8.896 Å, b = 5.706Å, c = 10.083Å, b = 113.88°

 

Colour:  Brown-red

Diaphaneity: Transparent

Luster:  Vitreous

Habit:  As grains of subhedral to euhedral crystals 20 to 60 micrometers, rare up to 200 micrometers across

Hardness:

Specific gravity:  4.03

Cleavage:

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:  Forms a series with piemontite.

 

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