Odd gemstone-like compound

List of anorganic and metal free (odd) gemstone compounds

• BN Boron nitride – likely incombustible
• BP Boron phosphide – incombustible

Adding sulfur in high quantity – this time it works – well, somewhat, without total decomposition into liquids or gasses

Unlike with organic gemstone-like compounds
in the case of metal free gemstones without a lot of carbon (and nitrogen) inside, adding sulfur to the mix this time works (well, somewhat).
The resulting compounds do not become high explosives that yearn to become gasses or liquids acommpanied with a high release of energy.

Adding a sulfur into the mix in high ratio does not make the metal and carbon free gemstones unstable (decomposing to gasses) immediately
but does instead lead some quite exotic stuff crossing over to polymeric nature:

Boron sulfides:

• B₂S₃ Boron sulfide (wikipedia)

Phosphorus sulfides from many stable stiff highly cross-linked molecules. E.g.:

• P₄S₁₀ Phosphorus pentasulfide – interrestingly this has diamondoid structure but it's limited to one molecule
• P₄S₃ Phosphorus sesquisulfide

Sulfur nitrides from many (somewhat) stable structures. E.g.:

• S₄N₄ Tetrasulfur_tetranitride (shock sensitive)
• (SN)_x Polythiazyl

Elemental sulfur:

• (S)_x Elemantal sulfur in form of long chains polysulfanes

Related

• Top: gemstone-like compound
• Superclass: Metal free gemstone-like compound
• Oddball compounds – (Not limited to gemstone-like compound, also listing molecular fluids and gasses)