Sillimanite

Povondraite

Sillimanite Vs Povondraite

Sillimanite

Povondraite

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Astrology

Origin

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

Color

Blue, Green, Brownish, Greenish, Colorless, gray

Brownish, Black

Streak

White

Brown

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

3.20-3.263.26

1 7.18

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Fracture

Splintery

Uneven

Cleavage

{010} perfect

None

Mohs Hardness

6-7.5-9999

2 10

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Chemical Composition

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

NaFe3+3Fe3+6(BO 3) 3Si 6O 18(O,OH) 4Anthony et al , Handbook of Mineralogy (2001)

Optical Properties

Luster

Vitreous, Subadamantine, Silky

Resinous

Pleochroism

Colourless to pale brown to yellow

Strong: yellow-brown

Dispersion

0.020.02

0.005 1

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Transparency

Transparent, Translucent

Translucent

Refractive Index

1.653-1.685-9999

1 3.25

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Optic Character

Crystal System

Orthorhombic

Birefringence

0.020-0.022-9999

0 0.296

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Clarity

Transparent

Translucent

Benefits

Physical

Neurological

Cardiovascular

Respiratory

Good

Reproductive

Digestive

Psychology

Creativity

Healing

Emotional healing

Qualities Associated

Creativity

Protection

Sillimanite Vs Povondraite Fracture

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

Compare Blue Gemstones

Sillimanite Vs Tortoiseshell

Sillimanite Vs Verdite

Sillimanite Vs Violane

Sillimanite Vs Povondraite Luster

A primary knowledge about Sillimanite vs Povondraite 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. Povondraite, on other hand, exhibits Resinous luster.