This quartz specimen comes from the Kergantic Kaolin Quarry near Ploemeur in Brittany, France. Numerous white to milky quartz crystals are densely intergrown, forming a compact, three-dimensional crystal group.
The individual crystals predominantly show clearly recognizable prismatic forms and crystal terminations. Due to their milky cloudiness, they appear largely opaque. The surfaces display a dull to locally vitreous luster.
Measuring 15.5 × 9.0 × 7.5 cm, the piece belongs to the large cabinet specimen size category. It weighs 1,018 g. The underside has been cut flat so that the specimen can be displayed in a stable position.
Quartz from the Classic Ploemeur Locality
The Kergantic Kaolin Quarry near Ploemeur is a well-known French locality for quartz. In addition to white and milky quartz, smoky quartz and amethyst have also been documented from this locality.
The large, densely crystallized formation and its origin from the historic kaolin mining area of Ploemeur make this a characteristic specimen from the locality.
| Feature | Details |
|---|---|
| Mineral | Quartz |
| Chemical composition | Silicon dioxide, SiOâ‚‚ |
| Variety | Milky quartz |
| Locality | Kergantic Kaolin Quarry, Ploemeur, Brittany, France |
| Dimensions | 15.5 × 9.0 × 7.5 cm |
| Weight | 1.018 g |
| Specimen Size | Large cabinet specimen |
| Color | White to milky |
| Luster | Dull to locally vitreous |
| Transparency | Opaque |
| Crystal Habit | Prismatic quartz crystals |
| Crystal arrangement | Densely intergrown crystal group |
| Modification | Underside cut flat for stable display |
| Special Feature | Milky quartz from the classic Ploemeur locality |
| Mineral | Quartz |
|---|---|
| Color | White |
| Size | Large cabinet (>10 cm) |
| Continent | Europe |
| Country | France |
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