This quartz-calcite specimen comes from Igea in the province of La Rioja, Spain. Six colorless rock crystals, measuring up to approximately 8 mm, sit on a dense coating of white calcite crystals.
The quartz crystals display well-defined faces and a pronounced vitreous luster. They stand out clearly against the white calcite and the underlying limestone matrix. Measuring 10.5 × 7.0 × 2.0 cm, this is a flat large cabinet specimen.
Rock Crystal on Calcite from Igea
Quartz and calcite occur together at Igea in fractures and cavities within the limestone. The combination of colorless quartz crystals and white calcite forms a typical and contrasting mineral association from this locality.
The specimen weighs 248 g and was personally collected during a mineral-collecting trip in the province of La Rioja.
| Feature | Description |
|---|---|
| Mineral | Quartz, rock crystal variety, on calcite |
| Locality | Igea, La Rioja, Spain |
| Dimensions | 10.5 × 7.0 × 2.0 cm |
| Weight | 248 g |
| Size category | Large cabinet specimen |
| Morphology | Six rock crystals up to approximately 8 mm on a coating of calcite crystals |
| Matrix | Limestone |
| Color | Colorless quartz on white calcite |
| Luster | Vitreous |
| Transparency | Transparent |
| Locality | Personally collected during a mineral-collecting trip in La Rioja |
| Mineral | Calcite, Quartz, Rock crystal |
|---|---|
| Color | Colorless |
| Size | Large cabinet (>10 cm) |
| Continent | Europe |
| Country | Spain |
| Feature | Self-collected |
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