Description: YOU ARE BIDDING ON 1 2.70 oz CALCITE CRYSTAL CLUSTER ON LIMSTONE MATRIX THIS CRYSTAL IS ABOUT 2 1/8 INCHES LONG & 1 3/4 INCHES WIDE & 1 1/8 INCHES TALL. THIS CRYSTAL WAS FOUND AT A LIMESTONE QUARRY IN VIRGINIA IN THE 1980's. BEAUTIFUL CRYSTAL. THIS IS A PIECE OF BLACK VIRGINIA LIMESTONE WITH A BLANKET OF CALCITE CRYSTALS ON BOTH SIDES..PERFECT STOCKING STUFFER. YOU WILL GET THE CRYSTAL YOU SEE IN THE PICTURES. INFORMATION ABOUT THIS CRYSTAL:Limestone (calcium carbonate CaCO3) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of CaCO3. Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological processes, though biological processes, such as the accumulation of corals and shells in the sea, have likely been more important for the last 540 million years. Limestone often contains fossils which provide scientists with information on ancient environments and on the evolution of life.About 20% to 25% of sedimentary rock is carbonate rock, and most of this is limestone. The remaining carbonate rock is mostly dolomite, a closely related rock, which contains a high percentage of the mineral dolomite, CaMg(CO3)2. Magnesian limestone is an obsolete and poorly-defined term used variously for dolomite, for limestone containing significant dolomite (dolomitic limestone), or for any other limestone containing a significant percentage of magnesium. Most limestone was formed in shallow marine environments, such as continental shelves or platforms, though smaller amounts were formed in many other environments. Much dolomite is secondary dolomite, formed by chemical alteration of limestone. Limestone is exposed over large regions of the Earth's surface, and because limestone is slightly soluble in rainwater, these exposures often are eroded to become karst landscapes. Most cave systems are found in limestone bedrock.Limestone has numerous uses: as a chemical feedstock for the production of lime used for cement (an essential component of concrete), as aggregate for the base of roads, as white pigment or filler in products such as toothpaste or paints, as a soil conditioner, and as a popular decorative addition to rock gardens. Limestone formations contain about 30% of the world's petroleum reservoirs.Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison. Large calcite crystals are used in optical equipment, and limestone composed mostly of calcite has numerous uses.Other polymorphs of calcium carbonate are the minerals aragonite and vaterite. Aragonite will change to calcite over timescales of days or less at temperatures exceeding 300 °C, and vaterite is even less stable. Wikipedia PLEASE PAY FOR YOUR ITEM WITH-IN 3 DAYS OF WINNING THE AUCTION. THANK YOU!! **YOU WILL LOVE THIS CRYSTAL** LOOKS GREAT. GET THIS 1 TODAY.. ALL ITEMS ARE SOLD AS IS, NO REFUNDS OR RETURNS
Price: 9 USD
Location: Richmond, Virginia
End Time: 2025-01-12T20:06:05.000Z
Shipping Cost: 5.85 USD
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All returns accepted: ReturnsNotAccepted
Shape: Natural
