It is often white, semiopaque, milky, or a faded yellow, (read full). Click the pictures to get full data, click the X to remove the gem from the list. The most common crystal forms of sphalerite are in dodecahedrons and tetrahedrons, elegant three-sided formations, often twinned, and otherwise usually massive, thus looking like brownish-black or (read full), Chalcedony: Chalcedony is a compact form of silica, composed of microscopic quartz crystals. It comes in yellow, green, pink, purple, violet, clear, and cat's eye. It is trimorphous with sillimanite and andalusite.

The most common occurrence is in the form of a cauliflower. There are very few gem quality pieces that have been produced. Sapphires are mostly recognized for their deep blue hue, but there are other colors too such as pink, yellow, green, and of course, white. It appears as massive, granular, or compact. Like quartz, calcite often has twinned structure caused by temperature and stress changes. Hauyne forms very bright and attractive though uncommon transparent blue dodecahedral or pseudo-octahedral crystals of the cubic sy (read full), Smithsonite: Smithsonite is a mineral in the group of Nitrates, Carbonates, Borates, with a hexagonal crystal system. It is also called beryllosodalite and reindeer stone, and crystallizes in the tetragonal system.

Its found near lead-zinc mines within limestone deposits. It sticks to the tongue and its taste sets the teeth on edge. It has a crystal surface reflecting light as in a mirror.

(4 out of 10 on the Moh (read full), Barite: Barite also called Baryte or heavy spar is a clear to yellowish to blue mineral that is very soft and not well suited for making of gemstones. The inner surface of the shell is made from smooth nacre which covers the mantle. A fine Albite gem will be colorless (mostly), or colored similar to moonstone. Layer stones are multi-layered materials used in the art of gem-carving and engraving, also called glyptog (read full), Onyx: Onyx is a translucent to semitransparent variety of Agate, which in turn is a variety of Chalcedony or cryptocrystalline quartz that is porous and consists of straight or parallel banded agate of alternating shades of milky white and black, gray and black, black and red, white and red, white and brown. It is a suitable mineral for collectors and is rarely cut as a gem, but massive varieties are carved as ornamental objects. The feldspars are major constituents of the rocks on the earth's crust and comprise some of the most important rock-forming minerals. All three have the same chemical compound but crystallize in three different forms. Twinned crystals are also common. It is opaque, has flat conchoidal, earthy fracture, and an orthorhombic microcrystalline system. It is a complex mineral of sodium, calcium, aluminum silicate, and sulfate. A continuous solid solution series exists between uvite and dravi (read full), Titanite: Titanite is a very rare calcium titanium silicate that is an important ore of titanium. Some of the better specimens have been found in upper North America including the United States and Canada It may be colorless, or white to cream and even yellow brown, sometimes pale pink. It may show brilliant reflections from inclusions. If you follow the zodiac then it's used to represent Libra. It appears in cubes, octahedrons, dodecahedrons, while other forms are rarer. It's blues, and greens look like oceans and forests. Kyanite is also known as disthene, meaning, "double strength." When found in granular, banded, fibrous masses, it looks like wood. It appears as cubes, octahedrons, and dodecahedrons, and rarely as crystals. But most of the time it appears with curved faces, like a thick creamy aqua-green mixture poured on rock and left to aggregate in clusters shaped like bunches of grapes, rounded, kidney-like, or to form like elegant icicles, and (read full), Cassiterite: Cassiterite may form as short or slender prismatic, or bipyramidal, elbow-shaped crystals. It appears as colorless or white crystals with grayish tints, elongated and generally twinned to form a reticulated network with 60-degree angles, as stubby, tabular crystals in star- or heart-shaped twins.

Howlite is found in borate deposits, with most ornamental pieces found from various sites in California (USA) and Mexico. It is unsaturated and rarely appears with inclu (read full), Grossular Garnet: Grossular is a nesosilicate in the Garnet group, with an isometric crystal system. We are a Koenig Media, LLC project and like our other ventures this one is free with no strings attached. It has the same crystal structure and outside appearance as powellite. It has the same composition as microcline, but is stable at slightly higher temperatures. The white gemstones are composed of alternate layers of orthoclase and albite, which refract light, giving the white gems the appearance of glowing from within. There are occasional chatoyant specimens, and four-rayed star stones with a brow (read full), Pearl: Pearl is one of four main ornamental materials that are classified as "organic" gems, the other three being coral, ivory, and amber.

Because of its high porosity (read full), Opal: Opal is hydrated silicon dioxide. Each generation of polyps dies in its protective home and each succeeding generation builds on top of its predecessor. Black/white and green/white-grey: Agate, Grey: Translucent, grey color with occasional banding: Labradorite: Grey-smoky color with blue-green flashes: Jasper, Silver Leaf: Swirls and spotted patterns in grey, black and white: Moonstone, Grey: Grey: Jasper, Dendritic: Cream to brown color with black/green: Jasper, Dalmatian: White/cream with black spots: Jasper, Sesame When found in groups of large bright crystals, it is usually called "diamond tin." The word achroite is Greek for colorless. Their (read full), Serpentine: Serpentine may refer to a single mineral but more often to a group of minerals including antigorite, chrysotile, clinochrysotile, and lizardite, which are altered products of basic and ultra-basic rocks.

This refers to the fact that the hardness along the length of kyanite c (read full), Nephrite: Nephrite is a silicate of calcium, magnesium, and iron, containing fluorine and hydroxyl. It occurs as prismatic, sometimes flat-sided crystals, but in rocks it is usually anhedral.

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