Donowensite

donowensite

mikehowardite

bokite

vanadate

Images

Formula: Ca(H2O)3Fe3+2(V2O7)2
Vanadate
Specific gravity: 2.97
Hardness: 3
Streak: Yellow
Colour: Yellow
Luminescence: Non-fluorescent
Environments

Sedimentary environments

Donowensite is a new mineral, approved in 2020 and to date (June 2022) reported only from the type locality.

Localities

At the type locality, the North Wilson pit, Union Carbide Mine, Wilson Springs, Garland county, Arkansas, USA, donowensite occurs as orange needles, up to about 1 mm in length, with wedge-shaped terminations.
The deposit occurs in altered sedimentary rocks adjacent to their contact with a syenite intrusion. The orebodies in general are the result of concentration of vanadium from original pyroxene and biotite within the feldspathoidal host. Many of the macroscopic mineral species are secondary (such as straczekite, montroseite and hewettite) and were formed during or after the alteration of vanadium-bearing pyroxene to vanadium-rich clay-sized material.
Donowensite occurs with mikehowardite, and both phases grow on a crust of red-orange radial fibrous bokite, and on a matrix composed of a mixture of bokite and an indistinct smectite-group mineral (CM 60.543-554).

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