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  2. Calcite - Wikipedia

    en.wikipedia.org/wiki/Calcite

    Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO 3). 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 ...

  3. Limestone - Wikipedia

    en.wikipedia.org/wiki/Limestone

    Limestone is commonly white to gray in color. Limestone that is unusually rich in organic matter can be almost black in color, while traces of iron or manganese can give limestone an off-white to yellow to red color. The density of limestone depends on its porosity, which varies from 0.1% for the densest limestone to 40% for chalk.

  4. Aragonite - Wikipedia

    en.wikipedia.org/wiki/Aragonite

    Aragonite is a carbonate mineral and one of the three most common naturally occurring crystal forms of calcium carbonate (Ca CO 3), the others being calcite and vaterite.It is formed by biological and physical processes, including precipitation from marine and freshwater environments.

  5. Calcium carbonate - Wikipedia

    en.wikipedia.org/wiki/Calcium_carbonate

    Crystal structure of calcite. Calcium carbonate is a chemical compound with the chemical formula Ca CO 3.It is a common substance found in rocks as the minerals calcite and aragonite, most notably in chalk and limestone, eggshells, gastropod shells, shellfish skeletons and pearls.

  6. Gemstone Meanings: Power and Significance of the 25 Most ...

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    Agate “Agate is earthy, warm and rich,” Salzer says, noting that it exists in many colors. “Look for antique Victorian banded Enlish and Scottish agates in deep orange, browns, cinnamon, and ...

  7. Marble - Wikipedia

    en.wikipedia.org/wiki/Marble

    Construction marble is a stone which is composed of calcite, dolomite or serpentine that is capable of taking a polish. [20] More generally in construction , specifically the dimension stone trade, the term marble is used for any crystalline calcitic rock (and some non-calcitic rocks) useful as building stone.

  8. Do You Know Your Birthstone? Here Are the Colors and Meanings ...

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  9. Your Birth Month's Color and Meaning, Explained

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    Meaning: Bud green is the color of new beginnings, whether you are entering a new phase in life or starting a new challenge. When to use it: If you want a new beginning or to energize your current ...

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