Biotite

Sillimanite

Biotite Vs Sillimanite

Biotite

Sillimanite

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Astrology

Origin

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

Color

Brown, Yellow, White, Greenish

Blue, Green, Brownish, Greenish, Colorless, gray

Streak

White, gray

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

Brittle

Tough

Solubility

Durability

Specific Gravity

2.7-3.33.20-3.26

1 7.18

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Fracture

Uneven, Even

Splintery

Cleavage

Perfect on the {001}

{010} perfect

Mohs Hardness

2.5-3.06-7.5

2 10

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Chemical Composition

K(Mg,Fe++)3[AlSi3O10(OH,F)2

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

Optical Properties

Luster

Vitreous, Pearly

Vitreous, Subadamantine, Silky

Pleochroism

Strong

Colourless to pale brown to yellow

Dispersion

-0.02

0.005 1

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Transparency

Transparent, Translucent

Refractive Index

1.565-1.6251.653-1.685

1 3.25

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Optic Character

Crystal System

monoclinic

Orthorhombic

Birefringence

0.03-0.070.020-0.022

0 0.296

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Clarity

Transparent

Benefits

Physical

Neurological

Enhances mental clarity and focus

Cardiovascular

Respiratory

Good

Reproductive

Digestive

Psychology

Grounding

Creativity

Healing

Emotional healing

Qualities Associated

Grounding

Creativity

Biotite Vs Sillimanite Fracture

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

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Biotite Vs Sillimanite Luster

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