Astrophyllite Vs Dravite
Origin
Canada, Russia
Southern and central Africa
Color
Brown, Yellow, Greenish, Brownish, Red
White, Colorless, Blue, Red, Green, Yellow, Violet, Black
Streak
Brown, White
Colorless
Specific Gravity
3.2-3.4
3.03-3.18
Fracture
Uneven
Uneven, Irregular, Conchoidal
Cleavage
Perfect on [001] imperfect on [100]
{???} Indistinct
Chemical Composition
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony 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)
Luster
Greasy, Pearly
Vitreous
Pleochroism
Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow
Very strong: pale yellow colorless
Transparency
Translucent
Transparent
Refractive Index
1.678-1.758
1.614-1.666
Crystal System
Triclinic
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Birefringence
0.050
0.014-0.032
Clarity
Translucent
Transparent
Neurological
Enhances mental clarity and focus
-
Cardiovascular
Supports heart health
-
Psychology
Self-Reflection
Self-acceptance
Healing
Spiritual healing
Emotional healing
Qualities Associated
Self-Reflection
Self-Exploration
Astrophyllite Vs Dravite Fracture
Fracture is an important parameter when you compare Astrophyllite and Dravite Physical Properties. It is necessary to understand the significance of these properties, before you compare Astrophyllite 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. Fracture observed in Astrophyllite is Uneven. Dravite fracture is Uneven, Irregular and Conchoidal.
Astrophyllite Vs Dravite Luster
A primary knowledge about Astrophyllite 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. Astrophyllite exhibits Greasy and Pearly luster. Dravite, on other hand, exhibits Vitreous luster.