Sillimanite

Bertrandite

Sillimanite Vs Bertrandite

Sillimanite

Bertrandite

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Astrology

Origin

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

Southern and central Africa

Color

Blue, Green, Brownish, Greenish, Colorless, gray

Colorless, Yellow

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

3.20-3.262.59-2.60

1 7.18

👆🏻

Fracture

Splintery

Cleavage

{010} perfect

{001} Perfect, {110} Distinct, {101} Distinct

Mohs Hardness

6-7.56-7

2 10

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Chemical Composition

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

Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)

Optical Properties

Luster

Vitreous, Subadamantine, Silky

Vitreous

Pleochroism

Colourless to pale brown to yellow

none.

Dispersion

0.020.01

0.005 1

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Transparency

Transparent, Translucent

TransparentAnthony et al

Refractive Index

1.653-1.6851.583-1.614

1 3.25

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Optic Character

Crystal System

Orthorhombic

Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21

Birefringence

0.020-0.022-9999

0 0.296

👆🏻

Clarity

Transparent

TransparentAnthony et al

Benefits

Physical

Neurological

Cardiovascular

Promotes mental clarity

Respiratory

Good

Reproductive

Digestive

Psychology

Creativity

Harmony

Healing

Emotional healing

Qualities Associated

Creativity

Sillimanite Vs Bertrandite Fracture

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

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