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Quartz is the second-most-abundant mineral in Earth's continental crust, after feldspar. Its...
A crystal dendrite is a crystal that develops with a typical multi-branching...
Rhodonite is a manganese inosilicate, (Mn, Fe, Mg, Ca)SiO3 and member of...
Rough Gem
The rubellite is a particularly beautiful gemstone from the colourful family of...
Rutile has among the highest refractive indices at visible wavelengths of any...
Rutile is a mineral composed primarily of titanium dioxide, TiO2.Rutile is the...
Sapphire is a precious gemstone, a variety of the mineral corundum, consisting...
The scapolites (Gr. asairos, rod, stone) are a group of rock-forming silicate...
Spessartite is a nesosilicate, manganese aluminium garnet species, Mn2+3Al2(SiO4)3.The name is a...
Sphalerite ((Zn,Fe)S) is a mineral that is the chief ore of zinc....
Sphene (from the Greek sphenos (σφηνώ), meaning wedge), is a calcium titanium...