Hematolite Locality: Moss mine, Nordmark, Filipstad, Värmland, Sweden Picture width 3 mm. Collection and photograph Christian Rewitzer — Photo: Christian Rewitzer · CC BY-SA 3.0
Hematolite
Hematolite is an IMA-recognized mineral species in the arsenate class, with the chemical formula (Mn,Mg,Al)₁₅(AsO₄)₂(AsO₃)(OH)₂₃.
It crystallizes in the hexagonal crystal system (space group R3). It is a member of the Hematolite structural group.
Key properties: Mohs hardness 3.5; specific gravity 3.44–3.49; Pale chocolate-brown to reddish brown streak; Vitreous, pearly to submetallic on cleavages luster; optically uniaxial.
IMA symbol Hmt, grandfathered status — known before the IMA’s founding, named in 1884.
Found in fissures in metamorphosed limestone in metamorphosed Fe–Mn orebodies.
It is found associated with Manganosite, pyrochroite, magnetite, jacobsite, calcite, barite, fluorite.
Its name comes from the Greek for blood, in allusion to the color.