# Mineral Hardness Color Transparency Lustre Crystal System Probability See More
1Narsarsukite7.0Yellow, yellowish-white, grayish-white, honey-yellow, tan, greenish-yellowTransparent, TranslucentVitreous, PearlyTetragonal0.043
2Danburite7.0 - 7.5Pale yellow, yellowish-brown, colourlessTransparent, TranslucentVitreous, GreasyOrthorhombic0.009
3Forsterite7.0Green, pale yellow or white.Transparent, TranslucentVitreousOrthorhombic0.005
4Cordierite7.0 - 7.5Grey, blue, blue-violet, greenish, yellowish brown, colourless to very light blue in transmitted light.Transparent, TranslucentVitreousOrthorhombic0.004
5Boracite7.0 - 7.5Green, blue, colourless, grey, white, dark green (ferroan), colourless in transmitted lightTransparent, TranslucentAdamantine, VitreousOrthorhombic0.003
6Spodumene6.5 - 7.0Colourless, yellow, light green, emerald-green, pink to violet, purple, white, grayTransparent, TranslucentVitreous, DullMonoclinic0.003
7Andalusite6.5 - 7.5Pink to red brown, occasionally yellow, green, white, gray rarely violetTransparent, TranslucentVitreous, Sub-Vitreous, GreasyOrthorhombic0.003
8Dravite7.0Pale brown to dark-brown to brownish-black, also dark-yellow, blue.Transparent, TranslucentVitreous, ResinousTrigonal0.003
9Zunyite7.0Colourless, grey, white, flesh-redTransparent, TranslucentVitreousIsometric0.002