This natrolite specimen comes from the Richter Quarry near Hammerunterwiesenthal in the Saxon Ore Mountains. A larger cavity within the gray phonolite matrix is lined with numerous white to cream-colored natrolite crystals.
The crystals form dense, partly radial aggregates. Several crystal groups project freely into the cavity, giving the specimen a distinctly three-dimensional structure. The surfaces appear matte to silky. The crystals are opaque.
Measuring 9.0 × 8.0 × 3.0 cm, the piece belongs to the cabinet specimen size category. It weighs 156 g.
Natrolite from a Phonolite Occurrence in the Ore Mountains (Erzgebirge)
The Richter Quarry near Hammerunterwiesenthal is a well-known German locality for natrolite and other zeolite minerals. The quarry exposes phonolite in which various secondary minerals formed in fractures and cavities. Natrolite is one of the minerals documented from this locality.
Mineral-bearing fluids circulated through open spaces within the volcanic rock. Natrolite was deposited on the cavity walls and formed dense, partly radial crystal aggregates.
The lined cavity, radial crystal groups, and phonolite matrix make this piece a characteristic natrolite specimen from Hammerunterwiesenthal.
| Feature | Details |
|---|---|
| Mineral | Natrolite |
| Chemical Composition | Hydrated sodium aluminum silicate, Na₂Al₂Si₃O₁₀ · 2H₂O |
| Locality | Richter Quarry, Hammerunterwiesenthal, Oberwiesenthal, Erzgebirge district, Saxony, Germany |
| Dimensions | 9.0 × 8.0 × 3.0 cm |
| Weight | 156 g |
| Specimen Size | Cabinet specimen |
| Color | White to cream-colored |
| Luster | Matte to silky |
| Transparency | Opaque |
| Crystal Habit | Fine, elongated natrolite crystals |
| Crystal arrengement | Dense, partly radial aggregatese |
| Matrix | Gray phonolite |
| Formation | Zeolite formation in fractures and cavities within phonolite |
| Special Feature | Cavity lined with natrolite crystals |
| Mineral | Natrolite |
|---|---|
| Color | White |
| Size | Cabinet specimen (7-10 cm) |
| Continent | Europe |
| Country | Germany |
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