Gedrite Vs Dravite
Origin
Southern and central Africa
Southern and central Africa
Color
Brown, Green, gray, White
White, Colorless, Blue, Red, Green, Yellow, Violet, Black
Streak
gray, White
Colorless
Specific Gravity
3.15-3.259
3.03-3.18
Fracture
-
Uneven, Irregular, Conchoidal
Cleavage
Gedrite Magnesiogedrite , Comments: Dark gray cleavage fragment of magnesiogedrite (gedrite). , Location: Bamble, Telemark, Norway. , Scale: See Image.
{???} Indistinct
Mohs Hardness
5.5-6
7-7.5
Chemical Composition
(Mg,Fe2+ ) 2[(Mg,Fe2+ ) 3Al 2](Si 6Al 2)O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Pleochroism
Weak to moderate
Very strong: pale yellow colorless
Transparency
Transparent
Transparent
Refractive Index
1.625-1.718
1.614-1.666
Crystal System
Orthorhombic Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Birefringence
-9999
0.014-0.032
Clarity
Transparent
Transparent
Psychology
Focus
Self-acceptance
Healing
-
Emotional healing
Qualities Associated
Protection
Self-Exploration
Gedrite Vs Dravite Fracture
Fracture is an important parameter when you compare Gedrite and Dravite Physical Properties. It is necessary to understand the significance of these properties, before you compare Gedrite Vs Dravite 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. Dravite fracture is Uneven, Irregular and Conchoidal.
Gedrite Vs Dravite Luster
A primary knowledge about Gedrite vs Dravite 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. Gedrite exhibits Vitreous luster. Dravite, on other hand, exhibits Vitreous luster.