Coquimbite crystals from the Dexter # 7 Mine, UT, USA – miniature specimen as unique piece
This miniature specimen with Coquimbite crystals from Utah, USA, displays a striking combination of intense violet to purple crystals on a light partly yellow coated matrix. The strong coloration makes the specimen especially attractive and creates a vivid contrast between the different mineral phases.
The Coquimbite crystals are well developed and show clearly recognizable partly blocky to prismatic forms. The crystal faces reflect light vividly, emphasizing the strong crystalline character. The formation is unusually distinct for this rare sulfate mineral and gives the specimen a high aesthetic quality.
Geology & Origin
Coquimbite is a hydrated iron aluminium sulfate that forms in the oxidation zone of sulfide deposits. The Dexter #7 Mine in Utah is known for a wide range of secondary sulfate minerals formed under arid conditions through weathering processes. Such minerals commonly occur in cavities and on rock surfaces as crystal coatings or well formed crystals.