Question about triagons ?

[Jewel of the Nile]

Are diamonds the only mineral that have them on their surface? I have a stone that appears to have a lot of them on it's surface. I don't want to get my hopes up by thinking diamond, but Idk of any other minerals that have these triangular markings. If anyone has any info on this, please let me know.

 

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[Turkısh Man]

Again, the trigonal system is a subsystem of the hexagonal. Most gem references will list these as hexagonal.
...

Minerals that form in the trigonal system include all varieties of Quartz, (agates, aventurine, chalcedony, jasper, tiger eye, citrine, amethyst, etc.,) Benitoite, Corundum, (rubies and sapphires,) Hematite, Rhodochrosite and Tourmaline.

 

[rock]

Post a pic of it

 

[StoneWhisper]

You Know after viewing some friends stones online (she had basicly the same question) but after viewing the stones/crystals I found out that the crystal point was made up of several crytsal points or AKA "crystal cathedral" which could have the same markings/design as you discribe.

 

[Turkısh Man]

Rough Diamonds


Diamond is almost pure Carbon (chemical formula, C).
Crystal system: Cubic (crystals are most commonly rounded octahedral)
Hardness: 10 (it is the standard for the Moh's hardness scale)
Density: 3.5
Colour: Colourless, white, pale yellow or blue (other colours occur but are less common).

Diamond is the hardest material known. It can be fluorescent, phosphorescent and triboluminescent. It also has the highest known thermal conductivity.

Because of its hardness it is widely used in industry as an abrasive and cutting material, for which purposes diamond can be made synthetically.

It is found in pipes of deep igneous origin composed of Kimberlite. It occurs in numerous locations world-wide though few are important economically. The richest deposits are in South Africa, Russia, Brazil and Australia.

 

[Eu_citzen]

Trigons, yeah, corundum may for example have them.