Agate

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Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 6,5 – 7,0

Specific Gravity 2,6 – 2,64

Refractive Index 1,53 – 1,543

Crystal System Trigonal

Luster Waxy

Cleavage None

Fracture Uneven

Color various

Pleochroism Absent

Mohs Hardness

Mohs hardness of Agate shown against the ten reference minerals, from talc (1) to diamond (10).

Mohs	Reference mineral	Agate
1	Talc
2	Gypsum
3	Calcite
4	Fluorite
5	Apatite
6	Orthoclase
7	Quartz	●
8	Topaz
9	Corundum
10	Diamond

Crystal System

Value & Market

Price Tier Moderate ($50-500/ct)

Where to Buy Agate

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

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Treatments

6.5 to 7Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) 2.60 to 2.64Walter Schumann, Gemstones of the world (2001) More from other references NoneWalter Schumann, Gemstones of the world (2001) UnevenWalter Schumann, Gemstones of the world (2001) 1.530 to 1.543Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Uniaxial/+Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references up to to 0.004Walter Schumann, Gemstones of the world (2001) More from other references AbsentWalter Schumann, Gemstones of the world (2001) NoneWalter Schumann, Gemstones of the world (2001) Banding of different colours. Colours are generally pale though varied; natural colours are green, yellow, red, reddish brown, white and bluish white, among others.Michael O?Donoghue, Gems, Sixth Edition (2006) Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references Waxygemdat.org, Management Team (2012) Varies with bands: partly strong; yellow, blue-whiteWalter Schumann, Gemstones of the world (2001) Trigonalgemdat.org, Management Team (2012) Microcrystalline aggregatesWalter Schumann, Gemstones of the world (2001) More from other references It occurs in filling cavities, and individual bands are concentric to the external surface of the mass or nodule. Agate geodes are found in basic lavas and other igneous flow rocks and have probably been formed by silica deposition in cavities created by gases.Michael O?Donoghue, Gems, Sixth Edition (2006) Agate information at mindat.org Brazil  Peru  UK  [Specimen in the Natural History Museum, London] USA  U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.

About Agate

A ágata é uma variedade de calcedónia caracterizada pelas suas bandas concêntricas de cores variadas, formadas pela deposição lenta de sílica em cavidades rochosas. Encontrada em todo o mundo, esta pedra semi-preciosa tem sido valorizada desde a Antiguidade, sendo utilizada na Grécia e Roma antigas para amuletos, selos e ornamentos. As suas bandas características são formadas por camadas de quartzo microcristalino que se depositam ao longo de milénios. Disponível numa vasta gama de cores, a ágata é popular em joalharia, objectos decorativos e como pedra de colecionador.

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