Oxide minerals and their features

The oxide mineral class includes those minerals in which the oxide anion (O2−) is bonded to one or more metal alloys 


Chemical formula : Fe2O3 

Mohs Scale : 5.5 - 6.5

Crystal System : Trigonal

Melting Point : 1538 C


Chemical formula :  AlO(OH) 

Mohs Scale : 6.5 - 7

Crystal System : Orthorhombic

Manganese Dendrites

Black dendritic films of various visually indistinguishable black manganese oxides, may consist of birnessite, coronadite, cryptomelane, hollandite, romanèchite, todorokite or other species. 

From Kütahya, Türkiye.


Chemical formula :  FeO(OH) 

Mohs Scale : 5, 5.5

Crystal System : Orthorhombic

Manganese Dendrites


Chemical formula : PbMoO4 

Mohs Scale : 3

Crystal System : Tetragonal

From Mexico


Manganese Dendrites

From Kütahya, Türkiye