Iolite

Sillimanite

Iolite Vs Sillimanite

Iolite

Sillimanite

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Astrology

Origin

Brazil, USA, Canada, Madagascar, Sri Lanka, India, Burma

USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil

Color

Blue, Violet, Yellow, Grey

Blue, Green, Brownish, Greenish, Colorless, gray

Streak

White

For which Rashi?

Libra, Sagittarius, Taurus

Planet

Jupiter

Element of Planets

Water

Energy

How to Wear?

Finger

Ring Metal

Deities

Not to wear with

Powers

Birthstone

Planetary

Talisman

Physical Properties

Tenacity

Tough

Solubility

Durability

Specific Gravity

2.6-2.73.20-3.26

1 7.18

👆🏻

Fracture

Splintery

Cleavage

3,1

{010} perfect

Mohs Hardness

7-7.56-7.5

2 10

👆🏻

Chemical Composition

Mg₂Al₄Si₅O₁₈

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Optical Properties

Luster

Vitreous

Vitreous, Subadamantine, Silky

Pleochroism

Colourless to pale brown to yellow

Dispersion

0.020.02

0.005 1

👆🏻

Transparency

Transparent, Translucent, Transparent to translucent

Transparent, Translucent

Refractive Index

1.52-1.561.653-1.685

1 3.25

👆🏻

Optic Character

Crystal System

Orthorhombic

Birefringence

-99990.020-0.022

0 0.296

👆🏻

Clarity

Transparent to translucent

Transparent

Benefits

Physical

Neurological

Enhances mental clarity and focus

Cardiovascular

Supports heart health

Respiratory

Excellent

Good

Reproductive

Digestive

Supports digestive health

Psychology

Intuition

Creativity

Healing

Emotional healing

Qualities Associated

Intuition

Creativity

Iolite Vs Sillimanite Fracture

Fracture is an important parameter when you compare Iolite and Sillimanite Physical Properties. It is necessary to understand the significance of these properties, before you compare Iolite Vs Sillimanite 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. Sillimanite fracture is Splintery.

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Iolite Vs Sillimanite Luster

A primary knowledge about Iolite vs Sillimanite 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. Sillimanite, on other hand, exhibits Vitreous, Subadamantine and Silky luster.