Sillimanite

Sapphire

Sillimanite Vs Sapphire

Sillimanite

Sapphire

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Astrology

Origin

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

Burma, Sri Lanka, India, Madagascar, Kenya, Tanzania, Thailand, Cambodia, China, Australia, USA

Color

Blue, Green, Brownish, Greenish, Colorless, gray

Colorless, Yellow, Green, Violet, White, Blue, Red, pink

Streak

White

For which Rashi?

Pisces, Taurus, Gemini, Libra

Planet

Saturn

Element of Planets

Water

Energy

How to Wear?

Finger

Ring Metal

Deities

Apollo

Not to wear with

Powers

Psychic Power

Birthstone

Planetary

Talisman

Physical Properties

Tenacity

Tough

Solubility

insoluble

Durability

Specific Gravity

3.20-3.263.95-4.03

1 7.18

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Fracture

Splintery

Uneven

Cleavage

{010} perfect

None, but may exhibit parting

Mohs Hardness

6-7.59

2 10

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Chemical Composition

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

Al ₂ O ₃

Optical Properties

Luster

Vitreous, Subadamantine, Silky

Vitreous, Adamantine

Pleochroism

Colourless to pale brown to yellow

Strong

Dispersion

0.020.02

0.005 1

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Transparency

Transparent, Translucent

Transparent, Translucent, Transparent to opaque

Refractive Index

1.653-1.6851.762-1.788

1 3.25

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Optic Character

Crystal System

Orthorhombic

Trigonal

Birefringence

0.020-0.0220.008-0.009

0 0.296

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Clarity

Transparent

Benefits

Physical

Neurological

Enhances mental clarity and focus

Cardiovascular

Respiratory

Good

Reproductive

Digestive

Psychology

Creativity

Intuition

Healing

Emotional healing

Qualities Associated

Creativity

Wisdom

Sillimanite Vs Sapphire Fracture

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

Compare Blue Gemstones

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Sillimanite Vs Sapphire Luster

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