metamorphic
Blue quartz-bearing rock, possibly chrysocolla-bearing quartzite
Quartz (SiO₂), with probable blue chrysocolla or copper-bearing clay minerals; exact identification requires testing
AI-generated identification · may be incorrectBlue-gray, white, and cream granular mass with vitreous to dull luster; no clear crystal faces or cleavage visible. Quartz hardness is about 7 Mohs, while chrysocolla is softer (2.5–3.5); specific gravity likely ~2.6–2.8.
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Physical properties
Blue-gray, white, and cream granular mass with vitreous to dull luster; no clear crystal faces or cleavage visible. Quartz hardness is about 7 Mohs, while chrysocolla is softer (2.5–3.5); specific gravity likely ~2.6–2.8.
Formation & geological history
Likely silica-rich rock altered by copper-bearing fluids, or a quartz vein containing blue secondary copper minerals. Such material can form in oxidized zones of copper deposits; age cannot be determined from the photograph.
Uses & applications
Attractive pieces may be used as lapidary rough, cabochons, or display specimens; low-grade material has little industrial value. Avoid assuming it is turquoise without testing.
Geological facts
The blue color may come from chrysocolla, azurite, copper-bearing smectite, or less commonly dumortierite. The San Luis de la Paz–Guanajuato region is geologically favorable for hydrothermal mineralization, making copper-stained quartz plausible.
Field identification & locations
Field clues include blue-green staining, quartz-rich texture, and possible copper minerals. Test hardness, streak, and acid reaction; chrysocolla commonly leaves a pale streak and is much softer than quartz, while turquoise is waxier and typically opaque.
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