metamorphic
Fuchsite in Quartz (Aventurine Quartz)
K(Al,Cr)2(AlSi3O10)(OH)2 (Fuchsite) + SiO2 (Quartz)
Hardness: 6.5-7 (Quartz majority); Color: Emerald green bands with white/translucent layers; Luster: Vitreous to pearly; Crystal structure: Hexagonal (Quartz) / Monoclinic (Mica); Cleavage: Perfect in mica layers, none in quartz.
- Hardness
- 6
- Color
- Emerald green bands with white/translucent layers
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6.5-7 (Quartz majority); Color: Emerald green bands with white/translucent layers; Luster: Vitreous to pearly; Crystal structure: Hexagonal (Quartz) / Monoclinic (Mica); Cleavage: Perfect in mica layers, none in quartz.
Formation & geological history
Formed through the regional metamorphism of argillaceous sediments or through hydrothermal alteration of ultramafic rocks. The green color is derived from chromium substitution within the muscovite mica (Fuchsite).
Uses & applications
Primarily used in jewelry as cabochons, decorative carvings, and as a popular 'healing' stone in metaphysical collecting.
Geological facts
Fuchsite is a chromium-rich variety of muscovite. When it occurs as tiny inclusions within quartz, it creates the 'aventurescence' effect seen in green aventurine, though this specimen shows distinct banded layering rather than uniform dispersion.
Field identification & locations
Identify by its characteristic 'emerald' green color and micaceous shimmer (schistose texture) within a hard quartz matrix. Found commonly in Brazil, India, and Zimbabwe. Collectors should look for distinct banding and vitreous clarity in the quartz layers.
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