Sainfeldite

Formula: Ca₅(AsO₄)₂(AsO₃OH)₂.4H₂O

Origin of name: for Paul Sainfeld, French geologist

Crystal system: monoclinic

Crystal class: 2/m

Twinning:

Unit cell: a = 18.64 Å, b = 9.81 Å, c = 10.12 Å, b = 97°

Colour: colourless to light pink

Diaphaneity: 

Luster: 

Habit: crystals fibrous, elongated along c-axis, minute, radiating groups or flattened rosettes

Hardness: 

Specific gravity: 3.04

Cleavage: 

Tenacity: 

Streak: 

Synonyms/varieties:

Comments: series with villyaellenite