Iridescent Goethite - Mineral Size:Medium as a filter medium for
Description
as a filter medium for water purification
Approximate size of 1 piece: 70mm x 70mm x 11
They can also be used to charge felt or leather buffs
Between the two shells is a layer of sedimentary Earth
the largest found was 1
Iridescent Goethite - Mineral Size:Medium as a filter medium forMined from: Tharsis, Spain Description: Iridescent goethite from Tharsis, Spain, is a variety of the mineral goethite (FeO(OH)) that exhibits a shimmering, rainbow like play of colors on its surface and a lovely botryoidal composition. This iridescence is typically caused by the thin film interference of light within microscopic layers or inclusions on the mineral's surface. The region of Spain from which these specimens are sourced is known for its
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