Sillimanite

Prehnite

Sillimanite Vs Prehnite

Sillimanite

Prehnite

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Astrology

Origin

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

Australia, Southern and central Africa, France

Color

Blue, Green, Brownish, Greenish, Colorless, gray

Green, Colorless, gray, Yellow, White

Streak

White

Colorless

For which Rashi?

Libra

Planet

Venus

Element of Planets

Earth

Energy

How to Wear?

Finger

Ring Metal

Deities

Freya

Not to wear with

Powers

Birthstone

Planetary

Talisman

Physical Properties

Tenacity

Tough

Brittle

Solubility

Durability

Specific Gravity

3.20-3.262.80-2.95

1 7.18

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Fracture

Splintery

Uneven

Cleavage

{010} perfect

Distinct on [001]

Mohs Hardness

6-7.56-6.5

2 10

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Chemical Composition

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

Ca₂Al₂Si₃O₁₂(OH)

Optical Properties

Luster

Vitreous, Subadamantine, Silky

Vitreous

Pleochroism

Colourless to pale brown to yellow

Dispersion

0.020.01

0.005 1

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Transparency

Transparent, Translucent

Translucent

Refractive Index

1.653-1.6851.611-1.673

1 3.25

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Optic Character

Crystal System

Orthorhombic

Birefringence

0.020-0.0220.021-0.033

0 0.296

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Clarity

Transparent

TranslucentHerve Nicolas Lazzarelli

Benefits

Physical

Neurological

Enhances mental clarity and focus

Cardiovascular

Respiratory

Good

Reproductive

Digestive

Psychology

Creativity

Harmony

Healing

Emotional healing

Physical healing

Qualities Associated

Creativity

Harmony

Sillimanite Vs Prehnite Fracture

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

Compare Blue Gemstones

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Sillimanite Vs Prehnite Luster

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