Magnesia: Also called periclase, magnesia is a light, solid, white earthy mineral composed of magnesium oxide. It is a source of magnesium and is used as a laxative.
A magnesia-rich, sedimentary rock resembling limestone, dolomite is either gray, pink or white in color.
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Periclase: See Magnesia.
Petit Point: A stone shaped to a fine point which is usually somewhat larger than needle point and is characterized by being round, oval, or having one rounded end.
Comments: used for magnesia refractories and a source of metallic magnesium. Buergerite ... see tourmaline
Bytownite ... see plagioclase feldspar Cabrerite ... see annabergite
Calamine ... hemimorphite ... smithsonite ...
magnesia 1) Industrial material made of magnesium oxide.
2) Describing a mineral that is composed of magnesium oxide. magnetic field The region within which the magnetism of a given substance or particle affects other substances.
The formation of the mountain is either red sandstone or limestone largely impregnated with magnesia. The mines are easily worked, the operation being more like digging a hole in sand, than quarrying rocks....
An Almandine in which the Ferrous Oxide is replaced partly by Magnesia is found at Luisenfeld in German East Africa. In the United Statesthere are many localities which yield Almandine.
The name originates from the Greek word for a district in Thessaly called Magnesia.
A crystallized silicate of lime and magnesia , gem quality diopside is relatively soft and brittle and most often bottle-green in colour, although it is also found colorless, brown, black, violet-green, and blue.
Chrysolite: (Also called "olivine" and "peridot") A mineral composed of silica, magnesia, and iron sometimes used as a gem. Chrysolite ranges in color from a light pea green to a deep olive green and an oily shine.
A mineral composed of silica, magnesia, and iron sometimes used as a gem. Chrysolite ranges in color from a light pea green to a deep olive green and an oily shine. It is common in certain volcanic rocks and meteorites.
Also known as Olivine is a yellowish green gemstone, composed of silica, magnesia, and iron. Common in certain volcanic rocks. The crusaders brought it back to Central Europe in the Middle Ages. Later revived as the Baroque era's most popular stone.
Nephrite is composed of silica and magnesia and its color is determined by the amount of iron present in the mineral. A lesser iron content produces lighter colors such as white, cream, yellow, grey, green, blue, red, brown and lavender.
It is transparent to opaque and is found in metosomatically altered magnesian or dolomitic limestones in contact-metamorphic aureoles. A blue Tourmaline emanates a high degree of harmony and are reported to bring about openness and tolerance.
" "A little of everything; there's always flint (silica) and clay (alumina) and magnesia in it and the black is iron, according to its fancy; and there's boracic acid, if you know what that is: and if you don't, ...
The name comes from the the ancient name Magnesia, in Asia, an ancient region bordering on Macedonia. It is now in Turkey.
Photos
& Locals:
1.) Diamantina, Minas Gerias, Brazil ...
Indicolite stones are transparent to opaque in shades and is found in metosomatically altered magnesian or dolomitic limestones in contact-metamorphic aureloes.
Peridot A yellowish green gemstone, composed of silica, magnesia, and iron. Common in certain volcanic rocks. Said to alleviate anger, fear, and anxiety, and aid digestion and insomnia. Buy Peridot Earrings ...
Dolmite
Dolomite is a magnesia-rich, sedimentary rock resembling limestone, and is either gray, pink or white in color.
A silicate of alumina, iron, and magnesia having a bright blue color and vitreous luster.
Iridescence
Reflection of light off internal features in a gem, giving rise to a rainbow like play of colors.
Dolomite
Usually gray, pink, or white mineral, essentially used as a construction and ceramic material, for a furnace refractory, and in fertilizer. A magnesia-rich sedimentary rock resembling limestone.
Lazulite ((Fe,Mg)Al2(OH)2(PO4)2) is a ferric and magnesian phosphate which is a characteristic azure blue in color.
The mineral species erythrite (Co3(AsO4)2-8H2O is a hydrous cobalt arsenate.
 See also: Color, Stone, Mineral, Iron, Crystal
  
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