Quartz (Var: Eisenkiesel), Gypsum
Montroy, Valencia, Valencian Community, Spain
A classical Spanish mineral. This very lustrous opaque quartz crystal to 13 mm, developed in red gypsum, is formed by the prism {100} and the equally developed rhombohedra {101} and {011}, giving these samples the classical double-terminated appearance. These red quartzs, commonly known as "Jacinto de Compostela", are hematite-included quartz that ...
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