Neptunite Gem Mine, San Benito Co., California miniature - x 2 x cm…
Lapis lazuli is a deep blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color. The most important mineral component of lapis lazuli is lazurite, a feldspathoid silicate mineral with the formula (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2. Most lapis lazuli also contains calcite (white), sodalite (blue), and pyrite (metallic yellow) with other minor components.
Epidote is a silicate mineral, a calcium aluminum iron silicate. It has a hardness of 6 to 7 on the Mohs scale. One of its distinguishing characteristics is strong pleochroism, where crystals display different colors -- green, brown and yellow -- as they
Photo: ExoticCrystals Charoite is a rare silicate mineral, first described in 1978 and named for the Chara River.
Moqui Marbles, Utah Iron Oxide concretions (Moqui Marbles) Moqui Marbles, Hematite Concretions, from the Navajo Sandstone of Southeast Utah. The Navajo Sandstone is also well known among rockhounds for its hundreds of thousands of Iron Oxide concretions
This mineral beauty, dubbed the "snow angel," was discovered during the digging of a well in India. The specimen is a silicate mineral called apophyllite-(KF), which appears in volcanic rocks. Shine On: Photos of Dazzling Mineral Specimens
Eudilayte from Russia - It is a somewhat rare, red silicate mineral, which forms in alkaline igneous rocks. Alternative names of eudialyte include: almandine spar and eudalite. Eucolite is the name of an altered form.
Benitoite is a rare blue barium titanium silicate mineral, found in hydrothermally altered serpentinite. It fluoresces under short wave ultraviolet light, appearing bright blue to bluish white in color. First described in 1907 by George D.
This cm) tourmaline goes up for auction June Tourmalines are boron silicate minerals that get their rainbow-like colors from various elements such as iron, sodium or magnesium. This specimen comes from Brazil.