Top 10 Gemstones with a Hexagonal Crystal SystemMetal_Treasure The hexagonal system gives the crystals six sides. Three of these are equal in length and meet at 60° to each other. The C, or vertical axis, is at 90° to the shorter axes.
Mineralogists sometimes divide the hexagonal crystal system into two systems based on their external appearance - the hexagonal and the trigonal. But the trigonal crystal system is a subsystem of the hexagonal and most gem references will list the trigonal system as hexagonal.
The Top Ten
There were images to these items... Why they suddenly disappeared? - Metal_Treasure
Clearly a Hexagonal Crystal Subsystem. It's visible - Metal_Treasure
Pretty. - Not_A_Weeaboo
Hexagonal subsystem, obviously. It's also visible.
The image shows Red Beryl, which is the rarest color for beryl, but beryl is usually colorless - Metal_Treasure
Its crystals have a Trigonal shape, so it's Trigonal subsystem of the Hexagonal system - Metal_Treasure
It belongs to the Hexagonal subsystem because aquamarine is just blue beryl and all beryls are with Hexagonal shapes - Metal_Treasure
Trigonal subsystem (the image shows black Sapphire but they can occur in all colors except red) - Metal_Treasure
Hexagonal subsystem - because Emerald is actually deep green beryl - Metal_Treasure
Its blue color is awesome (color isn't related to the crystal system though) - Metal_Treasure
Trigonal subsystem (the image shows Green Tourmaline - green is the classic color of the gem, but they can be different colors) - Metal_Treasure
Hexagonal subsystem because it's pink beryl - Metal_Treasure
Trigonal subsystem (amethyst is a semi-precious variety of quartz ) - Metal_Treasure
One of the rarest gems in the world - Metal_Treasure
Another extremely rare gem first found in Quebec, Canada - Metal_Treasure
Related ListsTop 10 Gemstones and Precious Metals with a Cubic / Isometric Crystal System Top 10 Gemstones with Two or More Colors Occurring in One Single Crystal Top 10 Gemstones with the Most Beautiful Rough Crystals Top 10 Gemstones that Have Green and Another Color in One Crystal Top 10 Gemstones with 6-sided Rough Crystals
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