Sillimanite

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Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 6.0 – 7.5

Specific Gravity 3.2 – 3.26

Refractive Index 1.653 – 1.685

Crystal System Orthorhombic

Cleavage Perfect

Color various

Birefringence 0.014

Pleochroism Strong trichroism is common for green stones: yellowish green - dark green - blue

Mohs Hardness

Mohs Hardness: 6.0 – 7.5

1 Soft10 Hard

Crystal System

Value & Market

Price Tier Moderate ($50-500/ct)

Where to Buy Sillimanite

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.

About Sillimanite

실리마나이트는 알루미늄 규산염 다형 변종 중 하나로, 무색·회색·갈색·녹색의 투명한 원석이 드물게 스리랑카와 미얀마에서 산출됩니다. 섬유상 실크 광택을 보이는 품종은 '피브로라이트'라 불리며, 고양이눈 효과를 나타내기도 합니다. 극히 드문 보석 등급의 투명 원석이 수집가 시장에서 거래됩니다.