Five siliceous pebbles suitable for use in assaying gold, Oman, 1994
Several samples of natural black pebbles from various locations, selected for their suitability for gold assaying purposes when used as touchstones: Five black pebbles collected on the beach at Medinat Qaboos, Muscat, Oman, in February 1994. Marked 1994-3
Touchstones are fine-grained siliceous stones, on whose abrasive surface a gold sample undergoing checks for purity would be rubbed. A streak of gold would be left on the stone’s surface, which could be compared against gold of known quality, to establish the sample’s purity. Touchstones were the main means of assaying the quality of gold throughout history, but remain in use today.
- Object Number:
- Gift of Dr W.A. Oddy
- Science Museum Group
Cite this page
We encourage the use and reuse of our collection data.
Data in the title, made, maker and details fields are released under Creative Commons Zero
Descriptions and all other text content are licensed under a Creative Commons Attribution 4.0 licence
Download catalogue entry as json
View manifest in IIIF viewer
Download manifest IIIF
Our records are constantly being enhanced and improved, but please note that we cannot guarantee the accuracy of any information shown on this website.