Onyx

Sillimanite

Onyx Vs Sillimanite

Onyx

Sillimanite

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Astrology

Origin

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

Color

White

Blue, Green, Brownish, Greenish, Colorless, gray

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

2.55-2.703.20-3.26

1 7.18

👆🏻

Fracture

Splintery

Cleavage

Indiscernible

{010} perfect

Mohs Hardness

6.5-76-7.5

2 10

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Chemical Composition

SiO₂

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

Optical Properties

Luster

Vitreous

Vitreous, Subadamantine, Silky

Pleochroism

Colourless to pale brown to yellow

Dispersion

0.010.02

0.005 1

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Transparency

Translucent, Opaque, Translucent to opaque

Transparent, Translucent

Refractive Index

1.530-1.5431.653-1.685

1 3.25

👆🏻

Optic Character

Crystal System

Trigonal

Orthorhombic

Birefringence

-99990.020-0.022

0 0.296

👆🏻

Clarity

OpaqueHerve Nicolas Lazzarelli

Transparent

Benefits

Physical

Neurological

Aids in mental clarity and focus

Cardiovascular

Respiratory

Good

Reproductive

Digestive

Psychology

Protection

Creativity

Healing

Emotional healing

Qualities Associated

Strength

Creativity

Onyx Vs Sillimanite Fracture

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

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