chrysoberyl – מילון אנגלי-אנגלי
Chrysoberyl
The mineral or gemstone
chrysoberyl is an
aluminate of
beryllium with the formula
BeAl2O4. The name chrysoberyl is derived from the
Greek words χρυσός
chrysos and βήρυλλος
beryllos, meaning "a gold-white spar". Despite the similarity of their names, chrysoberyl and
beryl are two completely different gemstones, although they both contain beryllium. Chrysoberyl is the third-hardest frequently encountered natural gemstone and lies at 8.5 on the
hardness scale, between
corundum (9) and
topaz (8).
chrysoberyl
Noun
1. a rare hard yellow green mineral consisting of beryllium aluminate in crystal form; used as a gemstone
(hypernym) mineral
(hyponym) alexandrite
(substance-meronym) beryllium, Be, glucinium, atomic number 4
Chrysoberyl
(n.)
A mineral, found in crystals, of a yellow to green or brown color, and consisting of aluminia and glucina. It is very hard, and is often used as a gem.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter.
About
Chrysoberyl
General Information:
Chemical Formula:BeAl2O4
Composition:(Molecular Weight = 126.97 gm)
Beryllium 7.10 %
BeAluminum 42.50 %
AlOxygen 50.40 %
O Empirical Formula: BeAl2O4
Environment:Granitic pegmatite dikes.
Locality:Takowaja, Russia.
Name Origin:From the Greek chrysos - "golden" and the mineral beryl.
Physical Properties: Cleavage:[110] Distinct, [010] Imperfect, [???] Imperfect
Color:blue green, brown, brownish green, green, or gray.
Density:3.5 - 3.84, Average = 3.67
Diaphaniety:Transparent to translucent
Habits:Twinning Common - Crystals are usually twinned., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Tabular - Form dimensions are thin in one direction.
Hardness:8.5 - Chrysoberyl
Luminescence:Non-fluorescent.
Luster:Vitreous (Glassy)
Streak:white
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chrysoberyl
