pyrope

The mineral pyrope is a member of the garnet group. Pyrope is the only member of the garnet family to always display red colouration in natural samples, and it is from this characteristic that it gets its name: from the Greek for fire and eye. Despite being less common than most garnets, it is a widely used gemstone with numerous alternate names, some of which are misnomers. Chrome pyrope, and Bohemian garnet are two alternate names, the usage of the later being discouraged by the Gemological Institute of America. Misnomers include Colorado ruby, Arizona ruby, California ruby, Rocky Mountain ruby, Bohemian carbuncle, and Cape ruby, .
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Noun
1. a deep red garnet used as a gemstone
(hypernym) garnet

(n.)
A variety of garnet, of a poppy or blood-red color, frequently with a tinge of orange. It is used as a gem. See the Note under Garnet.
  

General Information:
 Chemical Formula:
Mg3Al2(SiO4)3
 Composition:
(Molecular Weight = 403.13 gm)
Magnesium 18.09 % Mg
Aluminum 13.39 % Al
Silicon 20.90 % Si
Oxygen 47.63 % O 
 Empirical Formula:
Mg3Al2(SiO4)3
 Environment:
Ultra basic igneous rocks.
 Locality:
Zoblitz, Germany.
 Name Origin:
From the Greek, pyropos, "fiery-eyed" in allusion to the red hue.
Physical Properties:
 Cleavage:
None
 Color:
blood red, orange red, purple red, pink, or black red.
 Density:
3.65 - 3.84, Average = 3.74
 Diaphaniety:
Transparent to subtranslucent
 Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., Crystalline - Fine - Occurs as well-formed fine sized crystals., Lamellar - Thin laminae producing a lamellar structure.
 Hardness:
7.5 - Garnet
 Luminescence:
None.
 Luster:
Vitreous (Glassy)
 Streak:
white
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pyrope /'pairoup/
danh từ (khoáng chất) Pirop
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