What Are Thundereggs (Thunder Eggs) and Where to Find Them?
Thundereggs or thunder eggs are nearly spherical structures or rocky bodies filled with mineral masses or crystals in rhyolite volcanic
Thundereggs or thunder eggs are nearly spherical structures or rocky bodies filled with mineral masses or crystals in rhyolite volcanic
Druses are small to medium irregular cavities in rocks lined by small, well-formed clusters or aggregates of projecting crystals, usually
Vugs are small to medium irregular cavities, pores, or voids in rocks often lined with mineral crystals whose composition differs
Amygdales are small, round, or almond-shaped vesicles partly or fully filled with secondary minerals common in mostly volcanic or extrusive
Amygdaloidal basalts are basalt rocks with vesicles partially or fully filled with secondary minerals. The filled vesicles are called amygdales,
Andesite is an intermediate volcanic or extrusive igneous rock. Intermediate rocks are moderate in silica (52-63 wt.%), mafic, and felsic
Ultramafic is a common term in geology, GEOsciences, Earth sciences, or geography. It is commonly used in igneous rocks, their
The coarse-grained or phaneritic texture is an igneous rock texture in which you can see and distinguish individual minerals without
Carbonatites are uncommon and strange igneous rocks with more than 50% carbonate minerals by volume and less than 20 wt.
Dunite is an ultramafic plutonic or intrusive igneous rock in which olivine exceeds 90% by volume. Ultramafic means it has