| Country of Origin | United Kingdom |
|---|---|
| Type | Minerals/ Crystals |
| Certificated | Included |
| Photo | Shows as received |
| Sourced | Ethically |
| Sub-Type | Opal |
| Shape | Natural |
| Finish | Unpolished |
Check the listing for details. Opal Gunheath China Clay Pit Cornwall UK Natural Silica Specimen. Condition: New, Made in United Kingdom. Listed at 80.85 USD. Genuine Opal – Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall. This granite body underwent extensive hydrothermal alteration, resulting in world-renowned china clay (kaolin) deposits. Associated minerals in the Gunheath area commonly include.