Crystal Encyclopedia

Rutile

Rutile is a mineral composed primarily of titanium dioxide (TiO2). It is one of the three main minerals of titanium, along with ilmenite and leucoxene. Rutile is commonly found in igneous rocks, metamorphic rocks, and certain types of sedimentary rocks. It is a common accessory mineral in many ore deposits and is often associated with […]

Ruby

Ruby is a gemstone and a variety of the mineral corundum (Al2O3) that is distinguished by its red color, which is caused by trace amounts of chromium in the crystal structure. Ruby is a very hard and durable gemstone, with a hardness of 9 on the Mohs scale, and is often used in jewelry such […]

Tourmaline

Tourmaline is a fascinating gemstone that is known for its wide range of colors and unique properties. It is a crystalline mineral composed of complex borosilicate compounds and belongs to the cyclosilicate mineral group. Tourmaline is highly valued in the world of gemology and is cherished for its beauty and versatility. One of the most […]

Azurite

Azurite is a mineral that is commonly found in the oxidized zones of copper ore deposits. It is renowned for its vibrant blue color and has been used for various purposes throughout history. Azurite-malachite on gossan (Morenci Mine, Arizona, USA) Definition: Azurite is a copper carbonate mineral with the chemical formula Cu3(CO3)2(OH)2. It typically forms […]

Rose Quartz

Rose quartz is a pink-colored variety of the mineral quartz (SiO2), often considered one of the most popular and recognizable gemstones. It derives its name from its delicate rose-pink hue, which can range from pale to more intense shades. Rose quartz has been revered for centuries for its aesthetic appeal and its associations with love, […]

Apache Agate

Apache Agate is a type of chalcedony, a form of microcrystalline quartz known for its vibrant colors and banded appearance. Its unique name derives from the Native American Apache tribe, a nod to its historical significance and the regions where it is commonly found, particularly in the southwestern United States. This semi-precious stone holds both […]

Fancy Jasper

Fancy Jasper is a striking variety of jasper renowned for its vibrant and multi-colored appearance. This gemstone is characterized by its rich palette, featuring an array of hues such as greens, reds, browns, and yellows, often displayed in dynamic patterns of swirls, mottling, and speckling. Each piece of Fancy Jasper is unique, reflecting a natural […]