Minerals
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A mineral is a naturally occurring chemical compound usually of crystalline form and not produced by life processes. A mineral has one specific chemical composition, whereas a rock can be an aggregate of different minerals or mineraloids. The study of minerals is called mineralogy. To meet the definition of “mineral” used by most geologists, a substance must meet five requirements:
Axinite
Axinite is a group of uncommon, typically brown or violet-brown borosilicate minerals that form in specific geological settings. Known for its sharp, wedge-shaped crystals...
Gibbsite
Gibbsite is a naturally occurring mineral form of aluminum hydroxide with the chemical formula Al(OH)₃. It belongs to the hydroxides and oxides mineral class...
Crocoite
Crocoite is a rare mineral classified as a lead chromate (PbCrO₄). It is well-known for its vibrant orange-red color and distinctive crystal formations, which...
Gahnite
Gahnite is a mineral belonging to the spinel group, specifically a zinc aluminum oxide with the chemical formula ZnAl2O4ZnAl_2O_4ZnAl2O4. It is typically found in...
Bastnäsite
Bastnäsite is a group of rare earth fluorocarbonate minerals that includes bastnäsite-(Ce), bastnäsite-(La), and bastnäsite-(Y), with each type named after the dominant rare earth...
Pyromorphite
Pyromorphite is a secondary lead mineral that forms in the oxidation zones of lead ore deposits. It is classified as a member of the...
Psilomelane
Psilomelane is a barium manganese oxide mineral, typically presenting as black or dark gray with a submetallic to dull luster. It often forms botryoidal...
Proustite (Ruby Silver)
Proustite is a sulfosalt mineral composed of silver, arsenic, and sulfur, with the chemical formula Ag₃AsS₃. Known for its striking deep red color and...
Dumortierite
Dumortierite is a mineral renowned for its striking blue to violet-blue coloration and its significant presence in various geological formations worldwide. Named after the...
Phenakite
Phenakite is a rare and valuable gemstone known for its exceptional clarity and brilliance. It belongs to the beryllium aluminum silicate mineral group and...
Sard
Sard is a semi-precious gemstone known for its deep, rich red color, which ranges from reddish-brown to nearly black. It's a variety of chalcedony,...
Thulite
Thulite is a variety of the mineral zoisite known for its striking pink color. The pink hue is primarily due to manganese ions replacing...
