This page brings together 19 minerals whose names begin with the letter R, running alphabetically from “Realgar” to “Ralstonite.” They range from soft, colorful stones once used as pigments to hard ores that supply metals like titanium, manganese, and nickel. Many of these minerals are prized by collectors for their bright colors and unusual crystals, while others play a quiet but important role in industry and even battery chemistry.
Minerals are naturally occurring solid materials with a specific chemical makeup and an orderly internal crystal structure. They form the building blocks of rocks and have shaped human life for thousands of years, supplying everything from gemstones and pigments to the metals behind modern technology. Some, like the banded pink rhodochrosite, are so striking that they are cut and polished into jewelry and display pieces.
Below you’ll find the table with the mineral names and their descriptions.
Mineral: This gives you the official name of each mineral so you can quickly look it up, compare it with others, or learn more about it.
Description: This offers a short, plain-language summary of each mineral’s color, makeup, and common uses, helping you understand what makes it special at a glance.
Minerals
Mineral
Realgar
Rhodochrosite
Rhodonite
Rutile
Riebeckite
Rhodizite
Romanechite
Roselite
Rammelsbergite
Ramsdellite
Reinerite
Rhabdophane
Roquesite
Roeblingite
Ruizite
Rosasite
Retgersite
Reddingite
Ralstonite
Descriptions
Realgar
A soft, red-to-orange arsenic sulfide mineral once used as a pigment and in fireworks. It often forms alongside orpiment and slowly crumbles to powder when exposed to light.
Rhodochrosite
A pink-to-rose manganese carbonate prized as a gemstone, famous for its banded, candy-striped appearance. Fine crystals come from Argentina, Colorado, and South Africa.
Rhodonite
A pink manganese silicate often laced with black veins, used as an ornamental stone and minor gem. Its name comes from the Greek word for rose.
Rutile
A titanium dioxide mineral, typically reddish-brown to black, that is a major ore of titanium. Needle-like rutile inclusions create the “stars” in star sapphires and rubies.
Riebeckite
A blue-to-black sodium iron amphibole; its fibrous form is the asbestos known as crocidolite. The silica-rich variety tiger’s eye forms when quartz replaces it.
Rhodizite
A rare, very hard borate mineral, usually yellow to greenish, found mainly in Madagascar and Russia. It is sometimes cut as a collector’s gemstone.
Romanechite
A hard, black manganese oxide that is an important ore of manganese. It often forms botryoidal, grape-like masses and was once called psilomelane.
Roselite
A rose-red to pink cobalt-bearing arsenate mineral favored by collectors. It forms small, glassy crystals, notably from sources in Morocco.
Rammelsbergite
A silvery-white nickel arsenide mineral and a minor ore of nickel. It typically occurs in hydrothermal veins alongside other nickel and cobalt minerals.
Ramsdellite
A gray-to-black manganese oxide closely related to pyrolusite, of interest for battery chemistry. It commonly forms by alteration of other manganese minerals.
Reinerite
A rare zinc arsenite mineral, usually green to bluish, sought by collectors. It is best known from the Tsumeb mine in Namibia.
Rhabdophane
A reddish-to-brown rare-earth phosphate mineral that often forms crusts and earthy masses. It is a minor source of cerium and other rare-earth elements.
Roquesite
A rare copper indium sulfide mineral and one of the few indium-bearing minerals. It typically occurs as tiny grains within other sulfide ores.
Roeblingite
A white-to-colorless calcium lead silicate mineral that forms fibrous or massive aggregates. It is a rare species found in manganese deposits like Franklin, New Jersey.
Ruizite
An orange-brown, rare calcium manganese silicate that forms small sprays of bladed crystals. It was first described from Arizona and is prized by collectors.
Rosasite
A blue-green copper zinc carbonate that forms velvety crusts and botryoidal masses. It resembles malachite and is popular among mineral collectors.
Retgersite
An emerald-green nickel sulfate mineral that forms by weathering of nickel-bearing ores. It is water-soluble and typically appears as crusts or fibrous coatings.
Reddingite
A pink-to-colorless manganese iron phosphate found in granite pegmatites. It often forms small octahedral crystals alongside other phosphate minerals.
Ralstonite
A colorless-to-white fluoride mineral, now formally renamed hydrokenoralstonite, found in cryolite deposits. It typically forms tiny octahedral crystals in Greenland.
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