Mineral of the week
Achyrophanite
(K,Na)₃(Fe³⁺,Ti,Al,Mg)₅O₂(AsO₄)₅
Mineral
Hardness
—
Crystal system
Orthorhombic
Group
Oxides
Adamite
Zn₂AsO₄(OH)
Arsenate mineral
Hardness
3,5
Crystal system
Orthorhombic
Group
Phosphates
Adamsite-(Y)
NaY(CO₃)₂·6H₂O
Carbonate mineral
Hardness
3
Crystal system
Triclinic
Group
Carbonates
Classification
Mineral groups
Elements
Pure elements such as gold, sulfur and diamond.
118 minerals
Sulfides
Metal-sulfur compounds; pyrite, galena.
642 minerals
Halides
Salts such as halite and fluorite.
214 minerals
Oxides
Oxides & hydroxides — hematite, corundum.
531 minerals
Carbonates
Calcite, malachite, dolomite and more.
428 minerals
Sulfates
Gypsum, barite and related salt minerals.
387 minerals
Phosphates
Apatite, turquoise and phosphate minerals.
695 minerals
Silicates
The largest group — quartz, feldspar, mica.
1.483 minerals
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