Sillimanite

Onyx

Sillimanite Vs Onyx

Sillimanite

Onyx

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Astrology

Origin

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

Color

Blue, Green, Brownish, Greenish, Colorless, gray

White

Streak

White

For which Rashi?

Capricorn

Planet

Saturn

Element of Planets

Energy

How to Wear?

Finger

Ring Metal

Deities

Mars

Not to wear with

Powers

Protection

Birthstone

Planetary

Talisman

Capricorn

Physical Properties

Tenacity

Tough

Solubility

Durability

Specific Gravity

3.20-3.262.55-2.70

1 7.18

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Fracture

Splintery

Cleavage

{010} perfect

Indiscernible

Mohs Hardness

6-7.56.5-7

2 10

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Chemical Composition

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

SiO₂

Optical Properties

Luster

Vitreous, Subadamantine, Silky

Vitreous

Pleochroism

Colourless to pale brown to yellow

Dispersion

0.020.01

0.005 1

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Transparency

Transparent, Translucent

Translucent, Opaque, Translucent to opaque

Refractive Index

1.653-1.6851.530-1.543

1 3.25

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Optic Character

Crystal System

Orthorhombic

Trigonal

Birefringence

0.020-0.022-9999

0 0.296

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Clarity

Transparent

OpaqueHerve Nicolas Lazzarelli

Benefits

Physical

Neurological

Aids in mental clarity and focus

Cardiovascular

Respiratory

Good

Reproductive

Digestive

Psychology

Creativity

Protection

Healing

Emotional healing

Qualities Associated

Creativity

Strength

Sillimanite Vs Onyx Fracture

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

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Sillimanite Vs Onyx Luster

A primary knowledge about Sillimanite vs Onyx 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. Onyx, on other hand, exhibits Vitreous luster.