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Malachite is a copper carbonate hydroxide mineral, with the formula Cu 2 CO 3 (OH) 2.This opaque, green-banded mineral crystallizes in the monoclinic crystal system, and most often forms botryoidal, fibrous, or stalagmitic masses, in fractures and deep, underground spaces, where the water table and hydrothermal fluids provide the means for chemical precipitation.
Calcite alabaster also is known as onyx-marble, Egyptian alabaster, and Oriental alabaster, which terms usually describe either a compact, banded travertine stone [2] or a stalagmitic limestone colored with swirling bands of cream and brown. [3]
The dimension-stone industry classifies stone based on appearance and hardness as either "granite", "marble" or "slate". The granite of the dimension-stone industry along with truly granitic rock also includes gneiss , gabbro , anorthosite and even some sedimentary rocks .
Sněžník marble (sněžníkovský mramor) from Horní Morava, Ústí nad Orlicí District: light-coloured; Supíkovice marble (supíkovický mramor) from Supíkovice, Jeseník District: grey-white; Marble mis-nomers: Cetechovice marble (cetechovický mramor) from Cetechovice, Kroměříž District: coloured [c]
Chrysoprase (also spelled chrysophrase) is a green variety of chalcedony, which has been colored by nickel oxide. (The darker varieties of chrysoprase are also referred to as prase. However, the term prase is also used to describe green quartz and to a certain extent is a color-descriptor, rather than a rigorously defined mineral variety.)
The hardness of marble is very high, because the internal structure of the rock is very uniform after long-term natural aging, and the internal stress disappears, so the marble will not be deformed due to temperature, and has strong wear resistance. It is a popular building material.
Onyx stone comprises different minerals, including quartz, feldspar, and agate. This article about a specific stratigraphic formation in Arizona is a stub . You can help Wikipedia by expanding it .
Amazonite, also known as amazonstone, [4] is a green tectosilicate mineral, a variety of the potassium feldspar called microcline. [ 4 ] [ 5 ] [ 6 ] Its chemical formula is KAlSi 3 O 8 , [ 1 ] [ 7 ] which is polymorphic to orthoclase .