Origin
Brazil, USA, Canada, Madagascar, Sri Lanka, India, Burma
  
Sri Lanka
  
Color
Blue, Violet, Blue, Yellow, Grey
  
Blue
  
Streak
Not Available
  
Not Available
  
For which Rashi?
Libra, Sagittarius, Taurus, Libra, Sagittarius, Taurus, Libra, Sagittarius, Taurus
  
Sagittarius, Scorpio
  
Planet
Jupiter
  
Pluto
  
Element of Planets
Water
  
Not Available
  
How to Wear?
  
  
Finger
Not Available
  
Not Available
  
Ring Metal
Not Available
  
Not Available
  
Energy
Receptive
  
Projective
  
Deities
Goddess
  
Hephaestus
  
Not to wear with
Not Available
  
Not Available
  
Powers
Not Available
  
Money
  
Birthstone
  
  
Planetary
Not Available
  
Not Available
  
Talisman
Not Available
  
Not Available
  
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.6-2.7
  
3.65-4.55
  
Fracture
Not Available
  
ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
3,1
  
None, but may exhibit slight parting
  
Mohs Hardness
7-7.5
  
7.5-8
  
Chemical Composition
Mg2Al4Si5O18
  
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)
  
Luster
Vitreous
  
Vitreous
  
Pleochroism
Not Available
  
AbsentWalter Schumann
  
Dispersion
Not Available
  
Not Available
  
Transparency
Transparent, Translucent, Transparent to translucent
  
Gemmological Tables (2004)
  
Refractive Index
1.52-1.56
  
1.735-1.790
  
Optic Character
Not Available
  
Not Available
  
Crystal System
Orthorhombic
  
Isometric
  
Birefringence
Not Available
  
Not Available
  
Clarity
Transparent to translucent
  
TransparentUlrich Henn and Claudio C. Milisenda
  
Physical
  
  
Neurological
Not Available
  
Not Available
  
Cardiovascular
Not Available
  
Not Available
  
Respiratory
Not Available
  
Not Available
  
Reproductive
Not Available
  
Not Available
  
Digestive
Not Available
  
Not Available
  
Psychology
Not Available
  
Not Available
  
Healing
Not Available
  
Not Available
  
Qualities Associated
Not Available
  
Not Available
  
Iolite Vs Gahnospinel Fracture
Fracture is an important parameter when you compare Iolite and Gahnospinel Physical Properties. It is necessary to understand the significance of these properties, before you compare Iolite Vs Gahnospinel 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. Gahnospinel fracture is ConchoidalArthur Thomas and Gemstones (2009).
Iolite Vs Gahnospinel Luster
A primary knowledge about Iolite vs Gahnospinel 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. Iolite exhibits Vitreous luster. Gahnospinel, on other hand, exhibits Vitreous luster.