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

Lapis lazuli is a rock composed primarily of the minerals lazurite, pyrite and calcite. 

 From Afghanistan

Oncolite

Lapis Lazuli

Bauxite

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).

Ketonite

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

Silver Ore 

Uşak,  Türkiye

Septarian Nodule

Anyolite

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

Unakite is a pink and green metamorphic rock composed of pink orthoclase, green epidote, and colorless to milky quartz.

Ruby

Iron Banded Stone