Origin
Southern and central Africa
Ethiopia, Afghanistan, China, Australia, Origins: Brazil (major source); also found in USA, Germany, France, UK, Finland, Norway, Sweden, Namibia, Zaire, China and Australia.
Color
Colorless, Yellow
Brown, Green, White, Colorless, Yellow, Blue, gray, pink, Greenish
Specific Gravity
2.59-2.60
2.98-3.10
Fracture
-
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Cleavage
{001} Perfect, {110} Distinct, {101} Distinct
[100] Perfect, [110] Good, [011] Distinct
Chemical Composition
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Luster
Vitreous
Vitreous, Pearly
Pleochroism
none.
weak to none
Transparency
TransparentAnthony et al
-
Refractive Index
1.583-1.614
1.578-1.646
Optic Character
-
Biaxial/+
Crystal System
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21
Triclinic
Birefringence
-9999
0.020-0.030
Clarity
TransparentAnthony et al
TransparentUlrich Henn and Claudio C. Milisenda
Neurological
-
Enhances mental clarity and focus
Cardiovascular
Promotes mental clarity
-
Reproductive
-
Supports reproductive health
Healing
Emotional healing
Emotional healing
Qualities Associated
Creativity
Peace
Bertrandite Vs Amblygonite Fracture
Fracture is an important parameter when you compare Bertrandite and Amblygonite Physical Properties. It is necessary to understand the significance of these properties, before you compare Bertrandite Vs Amblygonite 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. Amblygonite fracture is Sub-Conchoidal, Irregular/uneven, Uneven and Conchoidal.
Bertrandite Vs Amblygonite Luster
A primary knowledge about Bertrandite vs Amblygonite 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. Bertrandite exhibits Vitreous luster. Amblygonite, on other hand, exhibits Vitreous and Pearly luster.