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Calcite, Quartz
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| Mineral: | Calcite: CaCO3 Quartz: SiO2 | |||||
| Comments: | Purple-colored druse of amethystine quartz and white calcite. | |||||
| Location: | Rio Grande do Sul, Brazil. | |||||
| Scale: | Sample size 20 cm. | |||||
| Copyright: | © Dave Barthelmy | |||||
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