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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 .

  3. Mohs scale - Wikipedia

    en.wikipedia.org/wiki/Mohs_scale

    Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale. The Mohs scale (/ m oʊ z / MOHZ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.

  4. Calcium carbonate - Wikipedia

    en.wikipedia.org/wiki/Calcium_carbonate

    Ground calcium carbonate is an abrasive (both as scouring powder and as an ingredient of household scouring creams), in particular in its calcite form, which has the relatively low hardness level of 3 on the Mohs scale, and will therefore not scratch glass and most other ceramics, enamel, bronze, iron, and steel, and have a moderate effect on ...

  5. Hardnesses of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Hardnesses_of_the_elements...

    Mohs hardness of materials (data page) Vickers hardness test; Brinell scale This page was last edited on ...

  6. Hard water - Wikipedia

    en.wikipedia.org/wiki/Hard_water

    Analysis of water hardness in major Australian cities by the Australian Water Association shows a range from very soft (Melbourne) to hard (Adelaide). Total hardness levels of calcium carbonate in ppm are: Canberra: 40 [33] Melbourne: 10–26 [34] Sydney: 39.4–60.1 [35] Perth: 29–226 [36] Brisbane: 100 [37] Adelaide: 134–148 [38] Hobart ...

  7. Limestone - Wikipedia

    en.wikipedia.org/wiki/Limestone

    Limestone is composed mostly of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO 3). Dolomite, CaMg(CO 3) 2, is an uncommon mineral in limestone, and siderite or other carbonate minerals are rare. However, the calcite in limestone often contains a few percent of magnesium. Calcite in limestone is ...

  8. Is It Just Stress...Or Perimenopause? Doctors Explain ... - AOL

    www.aol.com/just-stress-perimenopause-doctors...

    Here's how to pinpoint when you're actually in this phase of life even if your symptoms (hot flashes, mood swings, stress, dryness) are nonspecific.

  9. Carbonate hardness - Wikipedia

    en.wikipedia.org/wiki/Carbonate_hardness

    Carbonate hardness, is a measure of the water hardness caused by the presence of carbonate (CO 2− 3) and bicarbonate (HCO − 3) anions. Carbonate hardness is usually expressed either in degrees KH (from the German "Karbonathärte"), or in parts per million calcium carbonate ( ppm CaCO 3 or grams CaCO 3 per litre|mg/L).

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