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"Mother-of-pearl" refers to mollusc shell material having pearlescence to rainbow iridescence. Such shell material is composed of nacreous aragonite (CaCO3, calcium carbonate), which is a polymorph of calcite.
These whitish mother-of-pearl cabochons are from modern freshwater bivalves ("mussels").
------------------------------------
Info. at:
en.wikipedia.org/wiki/Nacre
"Mother-of-pearl" refers to mollusc shell material having pearlescence to rainbow iridescence. Such shell material is composed of nacreous aragonite (CaCO3, calcium carbonate), which is a polymorph of calcite.
These pinkish mother-of-pearl cabochons are from modern freshwater bivalves ("mussels").
------------------------------------
Info. at:
en.wikipedia.org/wiki/Nacre
"Mother-of-pearl" refers to mollusc shell material having pearlescence to rainbow iridescence. Such shell material is composed of nacreous aragonite (CaCO3, calcium carbonate), which is a polymorph of calcite.
These whitish mother-of-pearl cabochons are from modern freshwater bivalves ("mussels").
------------------------------------
Info. at:
en.wikipedia.org/wiki/Nacre
"Mother-of-pearl" refers to mollusc shell material having pearlescence to rainbow iridescence. Such shell material is composed of nacreous aragonite (CaCO3, calcium carbonate), which is a polymorph of calcite.
These pinkish mother-of-pearl cabochons are from modern freshwater bivalves ("mussels").
------------------------------------
Info. at:
en.wikipedia.org/wiki/Nacre
"Mother-of-pearl" refers to mollusc shell material having pearlescence to rainbow iridescence. Such shell material is composed of nacreous aragonite (CaCO3, calcium carbonate), which is a polymorph of calcite.
These pinkish mother-of-pearl cabochons are from modern freshwater bivalves ("mussels").
------------------------------------
Info. at:
en.wikipedia.org/wiki/Nacre
"Mother-of-pearl" refers to mollusc shell material having pearlescence to rainbow iridescence. Such shell material is composed of nacreous aragonite (CaCO3, calcium carbonate), which is a polymorph of calcite.
These pinkish mother-of-pearl cabochons are from modern freshwater bivalves ("mussels").
------------------------------------
Info. at:
en.wikipedia.org/wiki/Nacre
"Mother-of-pearl" refers to mollusc shell material having pearlescence to rainbow iridescence. Such shell material is composed of nacreous aragonite (CaCO3, calcium carbonate), which is a polymorph of calcite.
These whitish mother-of-pearl cabochons are from modern freshwater bivalves ("mussels").
------------------------------------
Info. at:
en.wikipedia.org/wiki/Nacre
"Mother-of-pearl" refers to mollusc shell material having pearlescence to rainbow iridescence. Such shell material is composed of nacreous aragonite (CaCO3, calcium carbonate), which is a polymorph of calcite.
These whitish mother-of-pearl cabochons are from modern freshwater bivalves ("mussels").
------------------------------------
Info. at:
en.wikipedia.org/wiki/Nacre
"Mother-of-pearl" refers to mollusc shell material having pearlescence to rainbow iridescence. Such shell material is composed of nacreous aragonite (CaCO3, calcium carbonate), which is a polymorph of calcite.
These pinkish mother-of-pearl cabochons are from modern freshwater bivalves ("mussels").
------------------------------------
Info. at:
en.wikipedia.org/wiki/Nacre
"Mother-of-pearl" refers to mollusc shell material having pearlescence to rainbow iridescence. Such shell material is composed of nacreous aragonite (CaCO3, calcium carbonate), which is a polymorph of calcite.
This pinkish mother-of-pearl cabochon is from a modern freshwater bivalve ("mussel").
------------------------------------
Info. at:
en.wikipedia.org/wiki/Nacre
"Mother-of-pearl" refers to mollusc shell material having pearlescence to rainbow iridescence. Such shell material is composed of nacreous aragonite (CaCO3, calcium carbonate), which is a polymorph of calcite.
These pinkish mother-of-pearl cabochons are from modern freshwater bivalves ("mussels").
------------------------------------
Info. at:
en.wikipedia.org/wiki/Nacre
Goby in an Edible sea urchin test (a rigid shell or test comprising fused plates of calcium carbonate), Echinus esculentus, Longberry.
Edible sea urchin, Echinus esculentus, Longberry. The protective test (made up of plates of calcium carbonate) has 5 rays with tube feel as in the starfish relatives. 20250526173028_01
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Calcite from the Cretaceous of Russia.
A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 6100 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.
The carbonate minerals all contain one or more carbonate (CO3-2) anions.
Calcite is a common mineral. It is calcium carbonate (CaCO3). It has a nonmetallic luster, commonly clearish to whitish to yellowish to grayish in color, is moderately soft (H≡3), moderately light-weight, has hexagonally-shaped scalenohedron crystals, and rhombohedral cleavage (three cleavage planes at 75º & 105º angles - cleavage pieces look like lopsided boxes). The easiest way to identify calcite is to drop acid on it - it easily bubbles (effervesces) in acid. The bubbles are carbon dioxide gas. If the acid is dilute hydrochloric acid, the chemical reaction is:
2HCl(aq) + CaCO3(s) -->> CO2(g)↑ + H2O(l) + CaCl2(aq)
The most important & voluminous calcitic rocks in the world are limestone (sedimentary), marble (metamorphic), carbonatite (igneous), and travertine (speleothem, or "cave formations", and many hotspring deposits). Quite a few hydrothermal veins in the world are calcitic or have calcite as a principal component.
The remarkable large, single crystal of calcite seen here has an odd form - the label described it as a prism and pinacoid. It comes from a polymetallic sulfide ore body at the famous Dalnegorsk skarn deposit in far-eastern Russia.
Locality: 2nd Sovietsky Mine (Second Soviet Mine), Dalnegorsk, far-eastern Russia
---------------------
Photo gallery of calcite:
www.mindat.org/gallery.php?min=859
Calcite from the Cretaceous of Russia.
A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 6100 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.
The carbonate minerals all contain one or more carbonate (CO3-2) anions.
Calcite is a common mineral. It is calcium carbonate (CaCO3). It has a nonmetallic luster, commonly clearish to whitish to yellowish to grayish in color, is moderately soft (H≡3), moderately light-weight, has hexagonally-shaped scalenohedron crystals, and rhombohedral cleavage (three cleavage planes at 75º & 105º angles - cleavage pieces look like lopsided boxes). The easiest way to identify calcite is to drop acid on it - it easily bubbles (effervesces) in acid. The bubbles are carbon dioxide gas. If the acid is dilute hydrochloric acid, the chemical reaction is:
2HCl(aq) + CaCO3(s) -->> CO2(g)↑ + H2O(l) + CaCl2(aq)
The most important & voluminous calcitic rocks in the world are limestone (sedimentary), marble (metamorphic), carbonatite (igneous), and travertine (speleothem, or "cave formations", and many hotspring deposits). Quite a few hydrothermal veins in the world are calcitic or have calcite as a principal component.
The remarkable large, single crystal of calcite seen here has an odd form - the label described it as a prism and pinacoid. It comes from a polymetallic sulfide ore body at the famous Dalnegorsk skarn deposit in far-eastern Russia.
Locality: 2nd Sovietsky Mine (Second Soviet Mine), Dalnegorsk, far-eastern Russia
---------------------
Photo gallery of calcite:
www.mindat.org/gallery.php?min=859
