Blue John

Sillimanite

Blue John Vs Sillimanite

Blue John

Sillimanite

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Astrology

Origin

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

Color

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

Blue, Green, Brownish, Greenish, Colorless, gray

Streak

White

For which Rashi?

Planet

Element of Planets

Energy

How to Wear?

Finger

Ring Metal

Deities

Not to wear with

Powers

Birthstone

Planetary

Talisman

Physical Properties

Tenacity

Tough

Solubility

Durability

Specific Gravity

3.00-3.253.20-3.26

1 7.18

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Fracture

Splintery

Cleavage

Perfect

{010} perfect

Mohs Hardness

-99996-7.5

2 10

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Chemical Composition

CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)

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

Optical Properties

Luster

Vitreous, Subadamantine, Silky

Pleochroism

Colourless to pale brown to yellow

Dispersion

0.020.02

0.005 1

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Transparency

Transparent

Transparent, Translucent

Refractive Index

1.432-1.4361.653-1.685

1 3.25

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Optic Character

Crystal System

Orthorhombic

Birefringence

-99990.020-0.022

0 0.296

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Clarity

Transparent

Benefits

Physical

Neurological

Enhances mental clarity and focus

Cardiovascular

Supports heart health

Respiratory

Excellent

Good

Reproductive

Digestive

Psychology

Harmony

Creativity

Healing

Emotional healing

Qualities Associated

Mental Clarity

Creativity

Blue John Vs Sillimanite Fracture

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

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