Sillimanite

Petalite

Sillimanite Vs Petalite

Sillimanite

Petalite

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Astrology

Origin

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

Canada, USA, Brazil, Italy, Mozambique, Zimbabwe, Russia, Burma, Australia

Color

Blue, Green, Brownish, Greenish, Colorless, gray

Colorless, gray, Yellow, White

Streak

White

Colorless

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

Brittle

Solubility

insoluble

Durability

Specific Gravity

3.20-3.262.40

1 7.18

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Fracture

Splintery

Subconchoidal, ConchoidalWalter Schumann, Conchoidal

Cleavage

{010} perfect

Perfect on {001}, poor on {201} with 38.5° angle between the two

Mohs Hardness

6-7.56-6.5

2 10

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Chemical Composition

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

LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Optical Properties

Luster

Vitreous, Subadamantine, Silky

Vitreous, Pearly

Pleochroism

Colourless to pale brown to yellow

Dispersion

0.020.01

0.005 1

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Transparency

Transparent, Translucent

Refractive Index

1.653-1.6851.502-1.523

1 3.25

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Optic Character

Crystal System

Orthorhombic

monoclinic

Birefringence

0.020-0.0220.012-0.016

0 0.296

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Clarity

Transparent

TransparentUlrich Henn and Claudio C. Milisenda

Benefits

Physical

Neurological

Cardiovascular

Respiratory

Good

Reproductive

Digestive

Psychology

Creativity

Calmness

Healing

Emotional healing

Qualities Associated

Creativity

Peace

Sillimanite Vs Petalite Fracture

Fracture is an important parameter when you compare Sillimanite and Petalite Physical Properties. It is necessary to understand the significance of these properties, before you compare Sillimanite Vs Petalite 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. Petalite fracture is Subconchoidal, ConchoidalWalter Schumann and Conchoidal.

Compare Blue Gemstones

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Sillimanite Vs Petalite Luster

A primary knowledge about Sillimanite vs Petalite 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. Petalite, on other hand, exhibits Vitreous and Pearly luster.