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Formula: Al2(PO4)(VO4).8H2O
Hydrated phosphovanadate, may dehydrate to
metaschoderite
Crystal System: Monoclinic
Specific gravity: 1.92 measured, 1.931 calculated
Hardness: 2
Streak: Yellow
Colour: Bright yellow-orange
Environments
Sedimentary environments
Hydrothermal environments
Localities
At the North Wilson pit, Union Carbide Mine, Wilson Springs (Potash Sulfur Springs), Garland County, Arkansas, USA,
schoderite is associated with hewettite,
duttonite, fervanite,
metaschoderite,
straczekite, apatite and
quartz
(HOM).
Schoderite from the North Wilson Pit -
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At Cockalorum Wash quad, Gibellini Mining District, Eureka County, Nevada, USA, schoderite is associated with
metahewettite,
metaschoderite, bokite,
minyulite and
leucophosphite
(HOM).
At the type locality, the Gibellini Vanadium Project, Fish Creek Range, Gibellini Mining District, Eureka County,
Nevada, USA, schoderite occurs sparsely in phosphatic chert of
lower Paleozoic age (541.0 to 419.2 million years ago), associated with
wavellite and vashegyite as
yellowish orange microcrystalline coatings along fractures in the chert.
Schoderite apparently was formed as the result of
supergene alteration of phosphatic
chert containing small amounts of
vanadium in the lattice of
fluorapatite. Alteration by meteoric waters was followed by
reprecipitation along fractures of a variety of secondary
minerals, including vashegyite,
wavellite, schoderite and
diadochite.
The Nevada locality represents a type of mineralisation where vanadium and
phosphorus are both present in significant amounts and tend to form minerals that are suitable for the study of the
replacement (VO4)3- for (PO4)3-
(AM 47.637-648).
Schoderite from the Gibellini Vanadium Project
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