Friedelite

friedelite

alabandite

kutnohorite

willemite

Images

Formula: Mn²⁺₈Si₆O₁₅(OH)₁₀
Phyllosilicate (sheet silicate), pyrosmalite group, manganese-bearing mineral
Hardness: 4 to 5
Streak: White, pink
Colour: Tan, brown, "beef steak" red-brown, dark brown
Common impurities: Fe,Al,Zn,Mg,Ca
Environments:

Metamorphic environments

Friedelite occurs in metamorphosed manganese-iron ore deposits (Webmin).

At Adervielle, France, friedelite is associated with rhodochrosite and alabandite (HOM).

At Franklin, New Jersey, USA, freidelite is associated with franklinite, willemite, calcite, rhodochrosite, baryte, chlorite and sphalerite (HOM).

At Kuruman, South Africa, freidelite is associated with calcite, kutnohorite, andradite and hausmannite (HOM).

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