Phenakite

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Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 7.5 – 8.0

Specific Gravity 2.9 – 2.98

Refractive Index 1.65 – 1.695

Crystal System Trigonal

Luster Vitreous

Fracture Conchoidal

Color various

Birefringence 0.016

Dispersion 0.015

Pleochroism Distinct: colorless - orangy-yellow

Mohs Hardness

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

Mohs	Reference mineral	Phenakite
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 Phenakite

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

Colorless material has been reported to turn a yellow-brown color on irradiation (Pough and Rogers, 1947). One could expect this change to be reversed by heating - Nassau (1984) 7.5 to 8Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 2.90 to 2.98Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references BrittleArthur Thomas, Gemstones (2009) GoodWalter Schumann, Gemstones of the world (2001) More from other references ConchoidalWalter Schumann, Gemstones of the world (2001) 1.650 to 1.695Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Uniaxial/+Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 0.016Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Distinct: colorless - orangy-yellowHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) 0.015Arthur Thomas, Gemstones (2009) Colourless, yellowish, pink, greenish blueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references VitreousArthur Thomas, Gemstones (2009) Inert to weak greenish, blue, pinkHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Specimens show a distinct blueMichael O?Donoghue, Gems, Sixth Edition (2006) TrigonalHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Rhombohedral, tabular to prismatic crystalsMichael O?Donoghue, Gems, Sixth Edition (2006) More from other references Phenakite occurs in granite pegmatites.Michael O?Donoghue, Gems, Sixth Edition (2006) More from other references (Veils of) 2-phase inclusions, rutile needles - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 4 Phenakite information at mindat.org Austria  France  Myanmar  Russia  Sri Lanka  USA  Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 437

About Phenakite

フェナカイト（偽石英）は、ベリリウムケイ酸塩鉱物（Be₂SiO₄）で、無色・淡黄・淡ピンク・淡青色の三角晶系結晶をガラス光沢とともに形成し、硬度7.5〜8という優れた硬さをもち、石英やトパーズと間違えられることがあります（名前はギリシャ語の「詐欺師」に由来）。ペグマタイト・雲母片岩・エメラルド産出雲母片岩に産し、ロシアのウラル山脈・ブラジル・ジンバブエ・タンザニアが主要産地です。高い屈折率による卓越した輝きを持ち、無色の切り石はコレクターに珍重されています。

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