Bomba volcánica
Bomba volcánica is a mineral with formula . This specimen comes from Isla de Elba, Portoferraio, Toscana, Italia and joined the Terrium collection in 1992.
Description
Volcanic bomb with a central cavity lined by dog-tooth calcite crystals and black acicular crystals, possibly augite or hornblende. The cavity shows a green coating, probably olivine. Marked greenish-yellow fluorescence and phosphorescence.
About Bomba volcánica
It is not defined by a specific mineral species but by its origin: a volcanic bomb ejected into the air that cools, forming an internal cavity. Within, vapours and element-rich fluids generate diverse secondary crystallisations. Its interest lies there, as an uncommon and visually powerful phenomenon.
About the locality
The island of Elba, in Tuscany, Italy, is known for its geological richness. Some of its volcanic formations contain bombs with internal cavities that crystallise a variety of secondary minerals, often fluorescent.
Technical data
- Catalogue No.
- 0077
- Name
- Bomba volcánica
- Category
- Cavella
- Matrix
- Bomba volcánica
- Associations
- calcita augita olivino hornblenda hematites
- Mine
- Isla de Elba
- District / Municipality
- Portoferraio
- Province
- Toscana
- Country
- Italia
- Size (cm)
- 7.5 x 7 x 6
- Weight
- 165.9 g
- Acquired
- 1992
- Ex-collection
- Marcos Velasco > Fran Becerra
- Etymology
- From the Italian "bomba", a volcanic projectile that solidifies in the air. Its interior may form a geode through uneven cooling and subsequent mineral infiltration.
- Quality
- Muy buena
- Value trend
- Estable
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