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Garnet Ball

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Original price $110
Current price $100

A rare shaped Garnet ball. 

Dimensions (length, width, height): 4.1cm x 3.5cm x 3.4cm

Weight: 105 grams

Origin: Shigar, Skardu, Pakistan

Color: Green & Purple



It also looks like a meteor ball.

 

 

GARNET:

Garnets are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives. Garnet is the birthstone of January.All species of garnets possess similar physical properties and crystal forms, but differ in chemical composition. The different species are pyrope, almandine, spessartine, grossular (varieties of which are hessonite or cinnamon-stone and tsavorite), uvarovite and andradite. The garnets make up two solid solution series: pyrope-almandine-spessartine (pyralspite) and uvarovite-grossular-andradite (ugrandite).

 

Properties

Garnet species are found in many colors including red, orange, yellow, green, blue, purple, pink, brown, black and colorless, with reddish shades most common.

Garnet species' light transmission properties can range from the gemstone-quality transparent specimens to the opaque varieties used for industrial purposes as abrasives. The mineral's luster is categorized as vitreous (glass-like) or resinous (amber-like).

Hardness

Because the chemical composition of garnet varies, the atomic bonds in some species are stronger than in others. As a result, this mineral group shows a range of hardness on the Mohs scale of about 6.0 to 7.5. The harder species like almandine are often used for abrasive purposes.

Magnetics used in garnet series identification

For gem identification purposes, a pick-up response to a strong neodymium magnet separates garnet from all other natural transparent gemstones commonly used in the jewelry trade. Magnetic susceptibility measurements in conjunction with refractive index can be used to distinguish garnet species and varieties, and determine the composition of garnets in terms of percentages of end-member species within an individual gem.

Uses

Garnet sand is a good abrasive, and a common replacement for silica sand in sand blasting. Mixed with very high pressure water, garnet is used to cut steel and other materials in water jets.

For water jet cutting, garnet extracted from hard rock is suitable since it is more angular in form, therefore more efficient in cutting.

Garnet paper is favored by cabinetmakers for finishing bare wood.

Garnet sand is also used for water filtration media.

 

General

Category

Nesosilicate

Formula

The general formula X3Y2(SiO4)3

Crystal system

Isometric

Crystal class

{\displaystyle 4/m{\bar {3}}2/m}

Space group

Ia3d

Identification

Color

virtually all colors, blue is very rare

Crystal habit

Rhombic dodecahedron or cubic

Cleavage

Indistinct

Fracture

conchoidal to uneven

Mohs scale hardness

6.5–7.5

Luster

vitreous to resinous

Streak

White

Specific gravity

3.1–4.3

Polish luster

vitreous to subadamantine

Optical properties

Single refractive, often anomalous double refractive

Refractive index

1.72–1.94

Birefringence

None

Pleochroism

None

Ultraviolet fluorescence

variable

Other characteristics

variable magnetic attraction

Major varieties

Pyrope

Mg3Al2Si3O12

Almandine

Fe3Al2Si3O12

Spessartine

Mn3Al2Si3O12

Andradite

Ca3Fe2Si3O12

Grossular

Ca3Al2Si3O12

Uvarovite

Ca3Cr2Si3O12