Bomba volcánica
Bomba volcánica is a mineral with formula . This specimen comes from Corcolle, Tivoli, Roma, Lazio, Italia and joined the Terrium collection in 1975.
Description
Complete volcanic bomb with a geode-like internal cavity. The cavity is partially lined with white and black microcrystals, with traces of green and lustrous areas. The whole forms a compact, porous, harmonious structure. Shows conspicuous green fluorescence and phosphorescence.
History of this specimen
This piece was collected by Dr Filippo Di Giovanni in the mid-1970s when it was still relatively easy to find good specimens in the area. Then I bought it from Giuseppe Passarino of SpezialMineral. Giuseppe described Filippo as a very skilful prospector with enormous mineralogical knowledge, but also with a difficult temperament and little habit of putting anything in writing. He was so aloof and detached that he ended up destroying many of the slides he himself had taken during his numerous research trips with other collectors and academics to hundreds of mines and historic deposits.
About Bomba volcánica
It is not defined by a single mineral species but by its origin: a volcanic bomb ejected into the air that cools to form an internal cavity. Inside, element-rich vapours and fluids produce diverse secondary crystallisations. Its interest lies in this uncommon, visually striking phenomenon.
About the locality
Corcolle (Tivoli) is a classic Italian locality for this type of volcanic structure. Bombs expelled during eruptions formed internal cavities where minerals such as ludwigite, augite, calcite or olivine precipitated, often with UV or phosphorescent effects.
Technical data
- Catalogue No.
- 0076
- Name
- Bomba volcánica
- Category
- Cavella
- Matrix
- Bomba volcánica
- Associations
- ludwigita augita olivino hematites calcita hornblenda
- Mine
- Corcolle
- District / Municipality
- Tivoli
- Province
- Roma
- Region
- Lazio
- Country
- Italia
- Size (cm)
- 10 x 8 x 7.5
- Weight
- 296.8 g
- Acquired
- 1975
- Ex-collection
- Dr. Filippo Di Giovanni > Giuseppe Passarino
- Etymology
- From 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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