sedimentary
Vuggy Limestone
Calcium Carbonate (CaCO3) with Quartz/Calcite inclusions
Hardness: 3-4 (matrix), 7 (quartz inclusions); Color: Gray, tan, white; Luster: Dull to vitreous in vugs; Structure: Massive with secondary vugs; Cleavage: None (conchoidal in quartz parts).
- Hardness
- 3-4 (matrix), 7 (quartz inclusions)
- Color
- Gray, tan, white
- Luster
- Dull to vitreous in vugs
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Physical properties
Hardness: 3-4 (matrix), 7 (quartz inclusions); Color: Gray, tan, white; Luster: Dull to vitreous in vugs; Structure: Massive with secondary vugs; Cleavage: None (conchoidal in quartz parts).
Formation & geological history
Formed in marine settings through the accumulation of shell, coral, and algal debris. The holes (vugs) were created later by groundwater dissolution or the decay of organic material, followed by secondary mineral precipitation.
Uses & applications
Primarily used as aggregate in construction, for making cement, and as a decorative landscaping stone. Not typically used in jewelry due to variable hardness.
Geological facts
This specimen contains 'vugs' (small cavities), which are often lined with crystals like druzy quartz or calcite. Some vugs in limestone can eventually grow into large cave systems.
Field identification & locations
Identify by its reaction (fizzing) to diluted acid. Often found in riverbeds or outcrops in tectonic regions. Collectors look for vugs containing well-formed crystals.
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