1) Manganese mineral 
Fluckite is an arsenate mineral with the chemical formula CaMnH2(AsO4)2·2(H2O). Fluckite`s mineral crystallography is triclinic meaning it has three axis of different length and three different interior angles that do not equal 90°. Because fluckite possesses three axes with different angles and lengths it is an anisotropic mineral. This means ....