Lapis lazuli

Fayalite

Lapis lazuli Vs Fayalite

Lapis lazuli

Fayalite

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1 Astrology

1.1 Origin

Afghanistan

Southern and central Africa

1.2 Color

Violet, Blue, White

Yellow, Brown, Black, Black

1.3 Streak

Blue

White

1.4 For which Rashi?

Sagittarius

Not Available

1.5 Planet

Venus

Not Available

1.6 Element of Planets

Water

Not Available

1.7 How to Wear?

1.7.1 Finger

Not Available

1.7.2 Ring Metal

Not Available

1.8 Energy

Receptive

Not Available

1.9 Deities

Venus

Not Available

1.10 Not to wear with

Not Available

1.11 Powers

Protection, Courage

Not Available

1.12 Birthstone

1.12.1 Planetary

Not Available

1.12.2 Talisman

Not Available

2 Physical Properties

2.1 Tenacity

Not Available

2.2 Solubility

Not Available

2.3 Durability

Not Available

2.4 Specific Gravity

2.50-3.004.392

1 7.18

2.5 Fracture

Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)

Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

2.6 Cleavage

3,6

{010} moderate, {100} imperfect

2.7 Mohs Hardness

5.56.5-7

2 10

2.8 Chemical Composition

The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)₈Al₆Si₆O₂₄(S,SO)₄

Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)

3 Optical Properties

3.1 Luster

Vitreous, Greasy

Vitreous, Resinous

3.2 Pleochroism

AbsentWalter Schumann

Faint

3.3 Dispersion

NoneNA

0.007 1

3.4 Transparency

Opaque

TransparentAnthony et al, Handbook of mineralogy (2001)

3.5 Refractive Index

1.500-1.6701.827-1.879

1 3.25

3.6 Optic Character

Not Available

3.7 Crystal System

Trigonal

Orthorhombic

3.8 Birefringence

Not Available0.042-0.051

0 0.296

3.9 Clarity

Gemstones of the world (2001)

TransparentAnthony et al

4 Benefits

4.1 Physical

4.1.1 Neurological

Not Available

4.1.2 Cardiovascular

Not Available

4.1.3 Respiratory

Not Available

4.1.4 Reproductive

Not Available

4.1.5 Digestive

Not Available

4.2 Psychology

Not Available

4.3 Healing

Not Available

4.4 Qualities Associated

Not Available

Lapis lazuli Vs Fayalite Fracture

Fracture is an important parameter when you compare Lapis lazuli and Fayalite Physical Properties. It is necessary to understand the significance of these properties, before you compare Lapis lazuli Vs Fayalite 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 Lapis lazuli is ConchoidalWalter Schumann, Gemstones of the world (2001) and Uneven-Conchoidal. Fayalite fracture is Brittle, Conchoidal, Conchoidal, ConchoidalAnthony et al and Handbook of mineralogy (2001).

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Lapis lazuli Vs Fayalite Luster

A primary knowledge about Lapis lazuli vs Fayalite 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. Lapis lazuli exhibits Greasy and Vitreous luster. Fayalite, on other hand, exhibits Resinous and Vitreous luster.