Orthorhombic

Orthorhombic

Discovered in 1824, this mineral was named in honor of Benjamin Silliman (1779-1864), a professor of chemistry and geology at Yale University. It is a comparatively rare mineral found in high-grade metamorphic rocks.

A common rock-forming mineral, olivine is found in mafic igneous rocks. The rock, dunite, is made up almost wholly of olivine. The transparent gem variety is known as peridot. It derives its name from the usual olive-green color.

Named by Jean-Claude Delametherie in 1798 for the type locality, the Andalusia region in Spain, a variety of this mineral has dark-colored inclusions that form a cruciform design. It is used in the manufacture of spark plugs and other high refractory porcelains and as a gemstone.

A member of the aragonite mineral group, this mineral was named after William Withering (1741-1799), an English physician and naturalist, who first described the mineral. It occurs in low-temperature hydrothermal veins.

A member of the aragonite mineral group, this mineral was named after its discovery in 1790 in Strontian, Scotland. It is mainly found as a low-temperature mineral in limestone. It is almost always fluorescent.

A member of the aragonite group of minerals, cerussite’s name comes from the Latin ceruss, meaning "white lead." It is a lead carbonate mineral usually found in the oxidized zone of lead ore deposits. It is a common weathering product of galena and other lead ore minerals. It is an ore of both lead and silver.

A member of the aragonite group of minerals, Aragonite is a low-temperature, near surface mineral that forms speleothemes in caves, massive lamellar deposits by geysers and hot springs, as seafloor oolites and as a replacement mineral. It was named in 1797 for the type locality, Molina de Aragon, Spain.

Wavelite was named in 1805 for William Wavell (1750-1829), a physician in Devonshire, England, who discovered the mineral. It is a secondary mineral found in low grade metamorphic rocks. It usually found as radiating "starburst" clusters of green fibrous crystals.

Discovered in 1834, this mineral occurs in granite pegmatites. The name is derived from the Greek for "threefold” plus "family" because it was thought to contain three cations (Fe, Li, Mn).

This mineral is characterized by its yellow-green color and strong fluorescence in UV light. An ore of uranium, its name comes from Autun, France. It is found in the oxidation zone of uranium bearing rocks including hydrothermal veins and granitic pegmatites.