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Marble is a metamorphic rock consisting of carbonate minerals (most commonly calcite (CaCO 3) or dolomite (CaMg (CO 3) 2 )) that have recrystallized under the influence of heat and pressure. [ 1] It has a crystalline texture, and is typically not foliated ( layered ), although there are exceptions. In geology, the term marble refers to ...
Synthetic diamond. Lab-grown diamonds of various colors grown by the high-pressure-and-temperature technique. Laboratory-grown ( LGD ), also called lab-grown diamond, [ 1] laboratory-created, man-made, artisan-created, artificial, synthetic, or cultured diamond, is diamond that is produced in a controlled technological process (in contrast to ...
Greek agate is a name given to pale white to tan colored agate found in the former Greek colony of Sicily as early as 400 BCE. The Greeks used it for making jewelry and beads. Brazilian agate is found as sizable geodes of layered nodules. These occur in brownish tones inter-layered with white and gray.
Carrara marble, or Luna marble (marmor lunense) to the Romans, is a type of white or blue-grey marble popular for use in sculpture and building decor. It has been quarried since Roman times in the mountains just outside the city of Carrara in the province of Massa and Carrara in the Lunigiana , the northernmost tip of modern-day Tuscany , Italy.
In archaeology, the term alabaster includes objects and artefacts made from two different minerals: (i) the fine-grained, massive type of gypsum, [ 1] and (ii) the fine-grained, banded type of calcite. [ 2] Chemically, gypsum is a hydrous sulfate of calcium, whereas calcite is a carbonate of calcium. [ 2] [ 3] As types of alabaster, gypsum and ...
Turquoise. Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6( PO 4)4( OH)8·4 H 2 O. It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.
Marble is a metamorphic rock derived from limestone, composed mostly of calcite (a crystalline form of calcium carbonate, CaCO 3).The original source of the parent limestone is the seabed deposition of calcium carbonate in the form of microscopic animal skeletons or similar materials.
David is a masterpiece [ 1][ 2] of Italian Renaissance sculpture, created from 1501 to 1504 by Michelangelo. With a height of 5.17 metres (17 ft 0 in), the David was the first colossal marble statue made in the early modern period following classical antiquity, a precedent for the 16th century and beyond. David was originally commissioned as ...
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