Rock types and their features

In geology, rock (or stone) is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. 

Lapis Lazuli

The most important mineral component of lapis lazuli is lazurite(25% to 40%), a tectosilicate mineral with the formula (Na,Ca)8[(S,Cl,SO4,OH)2|(Al6Si6O24)]. Most lapis lazuli also contains calcite (white), sodalite (blue), and pyrite (metallic yellow). Some samples of lapis lazuli contain augite; diopside; enstatite; mica; hauynite; hornblende, nosean, and sulfur-rich löllingite geyerite. Lapis lazuli was discovered around 6,000 years ago in the Hindu-Kush Mountains of present-day Afghanistan. Today, Afghanistan continues to be the leading producer of the lapis lazuli.


Banded Iron Formation


Bauxite is a sedimentary rock with a relatively high aluminium content. It is the world's main source of aluminium and gallium. Bauxite consists mostly of the aluminium minerals gibbsite (Al(OH)3), boehmite (Y-AlO(OH)) and diaspore (α-AlO(OH)), mixed with the two iron oxides goethite (FeO(OH)) and haematite (Fe2O3), the aluminium clay mineral kaolinite (Al2Si2O5(OH)4) and small amounts of anatase (TiO2) and ilmenite (FeTiO3 or FeO.TiO2).


Azurite (Cu3(CO3)2(OH)2) mineral in granite.

Silver Ore 

Silver ore from Uşak / Türkiye

Septarian Nodule


Anyolite is a metamorphic rock composed of intergrown green zoisite (Ca2Al3(SiO4)(Si2O7)O(OH) ), black/dark green pargasite (NaCa2(Mg4Al)(Si6Al2)O22(OH)2 ) and ruby (Al2O3:Cr).


Unakite is a pink and green metamorphic rock composed of pink orthoclase, green epidote, and colorless to milky quartz. These colors have helped Unakite become a popular lapidary material.Unakite forms when granite is altered by hydrothermal fluids, and plagioclase in the granite is transformed into epidote. Unakite is used as a construction material, an architectural stone and a gem material.