Purple, Red, or Roman Imperial Porphyry
Purple, red, or Roman Imperial porphyry refers to reddish to purplish porphyritic rocks highly-priced during the antiquity age by Romans
Igneous
Carbonatites Composition and Formation
Carbonatites are uncommon and strange igneous rocks with more than 50% carbonate minerals by volume and less than 20 wt.
Dunite Rock Composition and Uses
Dunite is an ultramafic plutonic or intrusive igneous rock in which olivine exceeds 90% by volume. Ultramafic means it has
Pyroxenite Rock Composition and Formation
Pyroxenite is coarse-grained ultramafic, mostly plutonic rock. Ultramafic means they have at least 90% dark-colored minerals rich in iron and