Traonyx: areas of origin, materials and further reading.
Three localities identified by Reza Molai for exploring Iranian traonyx.
USGS describes calcareous onyx as a dense crystalline carbonate, generally translucent and layered. This provides a useful reference for observing stone.
For a Traonyx selection, natural-light photographs and a sample trial help document the pattern and any light transmission. The response should be checked on the selected material and thickness.
In Reza Molai’s guide, Traonyx names the commercial category. USGS references provide geological context for travertine and calcareous onyx, including crystalline structures and layering.
Read article ↗A study of samples from Iranian quarries compares travertine and onyx travertine under magnesium sulfate crystallization tests.
Read article ↗