Alexandrite Vs Covellite
Origin
Russia, Brazil, Tanzania, Madagascar, Zambia, Sri Lanka, Burma, India, Color: color change, from bluish green (daylight) to purple, red or brown (incandescent light), Hardness: 8, Refractive index: 1.74 1.77, Density: 3.68 3.80, Chemical composition: BeAl2O4, Crystal structure: orthorhombic, Origins: Russia, Brazil, Tanzania, Madagascar, Zambia, Sri Lanka, Burma
Mexico
Color
Green
Blue, Blue, Black
Streak
Not Available
Grey, Black, gray
For which Rashi?
Scorpio
Not Available
Planet
Venus
Not Available
Element of Planets
Earth
Not Available
Finger
Not Available
Not Available
Ring Metal
Not Available
Not Available
Energy
Projective, Receptive
Not Available
Deities
Not Available
Not Available
Not to wear with
Not Available
Not Available
Powers
Love
Not Available
Planetary
Not Available
Not Available
Talisman
Not Available
Not Available
Tenacity
Not Available
Flexible
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.69-3.81
4.6-4.76
Fracture
Not Available
Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Metallic
Cleavage
1,1 ; 3,2.
Perfect on {0001}
Mohs Hardness
8.5
Not Available
Chemical Composition
BeAl 2 O 4
CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
Pleochroism
Not Available
Marked
Dispersion
Not Available
Not Available
Transparency
Transparent, Transparent to nearly opaque
OpaqueAnthony et al, Handbook of mineralogy (2001) More from other references
Refractive Index
1.739-1.770
1.45-2.62
Optic Character
Biaxial/+
Not Available
Crystal System
Orthorhombic
Hexagonal
Birefringence
0.007-0.010
Not Available
Clarity
Transparent
OpaqueAnthony et al
Neurological
Not Available
Not Available
Cardiovascular
Not Available
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Respiratory
Not Available
Not Available
Reproductive
Not Available
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Digestive
Not Available
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Psychology
Not Available
Not Available
Healing
Not Available
Not Available
Qualities Associated
Not Available
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Alexandrite Vs Covellite Fracture
Fracture is an important parameter when you compare Alexandrite and Covellite Physical Properties. It is necessary to understand the significance of these properties, before you compare Alexandrite Vs Covellite fracture. Whenever a gemstone chip breaks, it leaves a characteristic line along its breakage. Such lines are known as fracture and are used to identify the gemstones in their initial stages of production when they are in the form of rough minerals. Fracture is usually described with the terms “fibrous” and “splintery” to denote a fracture that usually leaves elongated and sharp edges. Covellite fracture is Brittle, Gemstones (2009), Gemstones (2009), Metallic and UnevenArthur Thomas.
Alexandrite Vs Covellite Luster
A primary knowledge about Alexandrite vs Covellite luster is useful in apparent identifications of these gemstones. Luster is the measure of light that gets reflected when incident on a finished cut gemstone. There are two major types of lusters: Silky and Adamantine. Since luster varies between two crystals of even the same gemstone, luster is limited to basic identification criteria. Alexandrite exhibits Vitreous luster. Covellite, on other hand, exhibits Resinous luster.