mineral
Ruby in Fuchsite
Corundum (Al2O3) in Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness varies significantly between the minerals: Ruby (Corundum) is 9 on the Mohs scale, while Fuchsite is 2 to 2.5. Color is a striking combination of deep pinkish-red (ruby) and sparkling emerald green (fuchsite). Luster ranges from vitreous to pearly.…
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Physical properties
Hardness varies significantly between the minerals: Ruby (Corundum) is 9 on the Mohs scale, while Fuchsite is 2 to 2.5. Color is a striking combination of deep pinkish-red (ruby) and sparkling emerald green (fuchsite). Luster ranges from vitreous to pearly. Crystal structure is trigonal for ruby and monoclinic for fuchsite.
Formation & geological history
Formed in metamorphic environments, specifically in greenschist to amphibolite facies rocks where chromium-rich solutions interact with aluminum-rich minerals under high pressure and temperature.
Uses & applications
Used primarily as a decorative gemstone, for ornamental carvings, and by crystal collectors due to its contrasting vibrant colors.
Geological facts
This specimen displays a combination of one of the hardest minerals known (ruby) alongside a soft, micaceous chromium-rich variety of muscovite (fuchsite). The distinctive red color of the ruby is caused by trace amounts of chromium.
Field identification & locations
Easily identified by the stark visual contrast of pink/red crystals embedded within a green, micaceous matrix. Commonly sourced from southern India.
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