Feldspar mineral, thin section viewed with polarized lighting. Feldspars make up about 60% of the Earth's crust

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Photo credit: © Scenics & Science / Alamy / Afripics
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Keywords: aluminium, aluminosilicates, anisotropic, birefractive, birefringence, birefringent, calcium, cross, micrograph, microscope, minerals, polarised, potassium, sodium, tectosilicate