Sillimanite

Opal

Sillimanite Vs Opal

Sillimanite

Opal

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Astrology

Origin

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

Ethiopia

Color

Blue, Green, Brownish, Greenish, Colorless, gray

Yellow, White, Red, Brown, Blue

Streak

White

For which Rashi?

Cancer, Libra, Scorpio

Planet

Mercury

Element of Planets

Earth, Air, Water

Energy

How to Wear?

Finger

Ring Metal

Deities

Cupid

Not to wear with

Powers

Astral Projection, Psychicism

Birthstone

Planetary

Talisman

Physical Properties

Tenacity

Tough

BrittleWalter Schumann

Solubility

hot salt water

Durability

Specific Gravity

3.20-3.261.98-2.25

1 7.18

👆🏻

Fracture

Splintery

Conchoidal

Cleavage

{010} perfect

None

Mohs Hardness

6-7.55-6.5

2 10

👆🏻

Chemical Composition

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

SiO₂ · nH₂O

Optical Properties

Luster

Vitreous, Subadamantine, Silky

Vitreous, Pearly

Pleochroism

Colourless to pale brown to yellow

None

Dispersion

0.020.01

0.005 1

👆🏻

Transparency

Transparent, Translucent

Transparent, Translucent, Transparent to translucent

Refractive Index

1.653-1.6851.37-1.52

1 3.25

👆🏻

Optic Character

Crystal System

Orthorhombic

Trigonal

Birefringence

0.020-0.022-9999

0 0.296

👆🏻

Clarity

Transparent

Benefits

Physical

Neurological

Enhances mental clarity and focus

Cardiovascular

Respiratory

Good

Reproductive

Digestive

Psychology

Creativity

Healing

Emotional healing

Qualities Associated

Creativity

Sillimanite Vs Opal Fracture

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

Compare Blue Gemstones

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Sillimanite Vs Opal Luster

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