Dravite Vs Astrophyllite
Origin
Southern and central Africa
Canada, Russia
Color
White, Colorless, Blue, Red, Green, Yellow, Violet, Black
Brown, Yellow, Greenish, Brownish, Red
Streak
Colorless
Brown, White
Specific Gravity
3.03-3.18
3.2-3.4
Fracture
Uneven, Irregular, Conchoidal
Uneven
Cleavage
{???} Indistinct
Perfect on [001] imperfect on [100]
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Luster
Vitreous
Greasy, Pearly
Pleochroism
Very strong: pale yellow colorless
Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow
Transparency
Transparent
Translucent
Refractive Index
1.614-1.666
1.678-1.758
Crystal System
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Triclinic
Birefringence
0.014-0.032
0.050
Clarity
Transparent
Translucent
Neurological
-
Enhances mental clarity and focus
Cardiovascular
-
Supports heart health
Psychology
Self-acceptance
Self-Reflection
Healing
Emotional healing
Spiritual healing
Qualities Associated
Self-Exploration
Self-Reflection
Dravite Vs Astrophyllite Fracture
Fracture is an important parameter when you compare Dravite and Astrophyllite Physical Properties. It is necessary to understand the significance of these properties, before you compare Dravite Vs Astrophyllite 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 Dravite is Uneven, Irregular and Conchoidal. Astrophyllite fracture is Uneven.
Dravite Vs Astrophyllite Luster
A primary knowledge about Dravite vs Astrophyllite 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. Dravite exhibits Vitreous luster. Astrophyllite, on other hand, exhibits Greasy and Pearly luster.