Johninnesite

Formula:  Na2Mn9(Mg,Mn)7(AsO4)2(SiO17)2(OH)8

Origin of name:  For John Innes, Namibian mineralogist

 

Crystal system:  Triclinic

Crystal class:  -1

Twinning: 

Unit cell: 

 

Colour:  Light yellow-brown

Diaphaneity: 

Luster:  Vitreous

Habit:  Bladed to fibrous aggregates to 4.5 cm long

Hardness

Specific gravity:  3.48

Cleavage:  2; {100} good, {010} poor

Tenacity: 

Streak:  Light brownish yellow

 

Synonyms/varieties:

 

Comments: 

 

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