$8.03
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Dolomite is a calcium carbonate-like (aka calcite) material. They are both used in ceramics and as fillers in resins, although calcite is used much more often than dolomite for that purpose. Calcium carbonate as a resin filler yields a fairly white, opaque blend. This dolomite as a resin filler yields a light to medium semi-translucent tan. We have a much coarser size that yields a more translucent light tan. Calcium carbonate and dolomite are similar in several ways. They are both carbonate minerals, both anhydrous, both found mostly in sedimentary rocks. Calcite, however, is easily found in all three types of rocks, sedimentary, igneous, and metamorphic. Their physical properties, like hardness, heaviness, colors found, are similar but not exactly the same. The chemical name for calcite is calcium carbonate. The chemical name for dolomite is calcium magnesium carbonate. You can tell from the chemical names that dolomite is like a calcium carbonate plus a magnesium carbonate. The formula for calcite is CaCO3. The formula for dolomite is CaCO3.MgCO3 (or CaMg(CO3)2). You can also see from the formulas that the main difference is the presence of magnesium in dolomite.
Their physical properties are:
-Calcium carbonate mohs hardness is 2.5-3.0.
-Dolomite mohs hardness 3.5-4.0.
-Calcium carbonate specific gravity 2.70-2.71.
-Dolomite specific gravity 2.84–2.86.
-Calcium carbonate is a source of calcium.
-Dolomite is a source of magnesium and calcium.
So, to sum up, they are similar but dolomite is somewhat harder and heavier than calcium carbonate. And dolomite gives us magnesium in addition to calcium, while calcium carbonate only gives us calcium (that matters when comparing the two for use in ceramics).
Other names for dolomite: dolomitic limestone, dolostone [the rock that contains dolomite], Magnesiodolomite, Pearl Spar, Compound Spar.
Some Mineralogy facts: it can have a pearly lustre, is sub-conchoidal when fractured and fractured surfaces can have a vitreous to sub-vitreous lustre, and it is translucent to transparent.
CAMEO, the art materials database lists a few uses of dolomite { http://cameo.mfa.org/wiki/Dolomite } :
"Although usually a translucent white in color, the mineral dolomite varies widely to yellow, pink, green, brown and gray. Iron is often a minor component replacing some of the magnesium. Dolomite rock has been and is currently used as a building stone, in furnace linings, in ceramics, and as a filler in paper. Under high temperatures and pressures, dolomite is metamorphosed into dolomitic marble."
Wikipedia lists additional uses { https://en.wikipedia.org/wiki/Dolomite } :
"Dolomite is used as an ornamental stone, a concrete aggregate, and a source of magnesium oxide [and] magnesium....Where calcite limestone is uncommon or too costly, dolomite is sometimes used in its place as a flux for the smelting of iron and steel. Large quantities of processed dolomite are used in the production of float glass.
In horticulture, dolomite and dolomitic limestone are added to soils and soilless potting mixes as a pH buffer and as a magnesium source.
Dolomite is also used as the substrate in marine (saltwater) aquariums to help buffer changes in pH of the water.
Calcined dolomite is also used as a catalyst for destruction of tar in the gasification of biomass at high temperature.
Particle physics researchers like to build particle detectors under layers of dolomite to enable the detectors to detect the highest possible number of exotic particles. Because dolomite contains relatively minor quantities of radioactive materials, it can insulate against interference from cosmic rays without adding to background radiation levels.
In addition to being an industrial mineral, dolomite is highly valued by collectors and museums when it forms large, transparent crystals. The specimens that appear in the magnesite quarry exploited in Eugui, Esteribar, Navarra (Spain) are considered among the best in the world.
Digital Fire, the ceramics material database, says { https://digitalfire.com/4sight/material/dolomite_273.html } :
"Dolomite as a ceramic material is a uniform calcium magnesium carbonate. In ceramic glazes it is used as a source of magnesium and calcium. Other than talc, dolomite is the principle source of MgO in high temperature raw glazes. 'Dolomite matte' stoneware glazes, for example, are highly prized for their pleasant 'silky' surface texture. Dolomite by itself is refractory, but when combined with the typical oxides in a glaze (especially boron) it readily enters the melt.
Dolomite Glaze Matteness [with] Silky surface:
Dolomite can be used in glazes melting over 1170C to produce a silky matte surface. This occurs because high percentages of dolomite help to form diopside crystals (CaMg(SiO3)2) on cooling, and it is these that produce the popular butter-matte effect."-
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Jun 7, 2024
I keep invertebrates, and try to accommodate as many aspects of their native habitats as possible. A handful of species I keep are native to the Balkan Peninsula, which is composed largely of limestone and dolomite. I've been very curious to offer these species a dolomite supplement, and this is the only place I have been able to find pure, powdered dolomite! It is clearly high quality, consistently powdered and, as far as I can tell (I don't have a lab, sadly), pure dolomite. Thank you for the unique products you offer!!
Stella
Dec 1, 2022
Megan
Dec 1, 2022
Megan
Oct 1, 2022
excellent! the product and delivery time awesome.....
Maria Soledad
Sep 27, 2022
EXCELLENT AND FAST SHIPPING! THANKS
Maria Soledad