Cuarzo Ahumado
Cuarzo is a mineral with formula SiO₂, in the Silicatos [Tectosilicatos (Grupo Cuarzo)] group. This specimen comes from Erongo Mountains, Karibib, Erongo, Erongo Region, Namibia and joined the Terrium collection in 2025.
Description
A single large smoky quartz crystal partially coated by a hyaline yellow layer of opal with characteristic surface bubbling. Under UV light, the opal shows intense green fluorescence.
About Cuarzo
Smoky quartz owes its colour to natural radiation in the geological environment. Hyaline opal is an amorphous variety of hydrated silica, lacking a defined crystal structure. It can form glassy films on other minerals and is well known for its fluorescence.
About the locality
Erongo is a mineral-rich volcanic and hydrothermal region in Namibia. Its pegmatites have produced notable specimens of quartz, tourmaline, beryl, fluorite and opal. Specimens with fluorescent hyaline opal on smoky quartz are scarce and collectable.
Technical data
- Catalogue No.
- 0080
- Composition
- SiO₂
- Name
- Cuarzo
- Variety
- Ahumado
- Group
- Silicatos [Tectosilicatos (Grupo Cuarzo)]
- Category
- Estélites
- Associations
- ópalo hialino
- Mine
- Erongo Mountains
- District / Municipality
- Karibib
- Province
- Erongo
- Region
- Erongo Region
- Country
- Namibia
- Size (cm)
- 9.7 x 2.6 x 2
- Weight
- 38.4 g
- Acquired
- 2025
- Etymology
- From the Sanskrit "upala", meaning "precious stone".
- Quality
- Muy buena
- Value trend
- Estable
Related specimens
- Azurita — Namibia
- Berilo (Aguamarina) — Namibia
- Boltwoodita — Namibia
- Cristobalita — Estados Unidos
- Cuarzo — Madagascar
- Amatista — Kazajistán
- Cuarzo (Cloritado) — Nepal
- Cuarzo (Cloritado) — Nepal