Amazonite

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A blue-green to turquoise variety of microcline feldspar, amazonite takes its color from trace lead and water held in the crystal lattice rather than from any Amazonian source, as its name misleadingly implies. The finest gem material has come from Colorado, Russia, and more recently Ethiopia and Madagascar. It crystallizes in the triclinic system and registers 6.0 to 6.5 on the Mohs scale, a modest hardness better suited to cabochons and carvings than to faceting. Bold opaque color and grid-like white streaks of perthite give the stone its recognizable look, and it remains a widely used semi-precious material in the moderate range.

Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 6.0 – 6.5

Specific Gravity 2.55 – 2.57

Refractive Index 1.522 – 1.53

Crystal System Triclinic

Luster Vitreous

Cleavage Perfect

Fracture Uneven,Conchoidal

Color various

Birefringence 0.008

Pleochroism Weak

Mohs Hardness

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

Mohs	Reference mineral	Amazonite
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 Amazonite

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

Links may earn a commission at no extra cost to you.

Treatments

6 to 6.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 2.55 to 2.57Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references BrittleWalter Schumann, Gemstones of the world (2001) PerfectMichael O?Donoghue, Gems, Sixth Edition (2006) Uneven,ConchoidalMichael O?Donoghue, Gems, Sixth Edition (2006) 1.522 to 1.530Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Biaxial/-Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 0.008 to 0.010Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references WeakMichael O?Donoghue, Gems, Sixth Edition (2006) WeakMichael O?Donoghue, Gems, Sixth Edition (2006) Green, blue-greenUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references Translucent,OpaqueHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Opaque with white grid-like pattern, rarely translucentMore from other references VitreousWalter Schumann, Gemstones of the world (2001) Weak; olive-greenWalter Schumann, Gemstones of the world (2001) Possible yellow-greenHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references TriclinicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references PrismaticWalter Schumann, Gemstones of the world (2001) Amazonite information at mindat.org Madagascar  Madagascar, extraLapis English No.1, 2001, p. 43 Myanmar  Ted Themelis (2008) Gems & mines of Mogok Peru 