£0.00View All
(0) Shopping Cart
Currency
FORTHCOMING EVENTS

​​​​​​​​​​​​​​​​​​​​​​​​
​​​​​​​For details of forthcoming events please click on the 'Shows & Fairs' tab above.​​​​​

​​​​​​​​​​​​​​
​​​​​​​​​​​​​​​​
​​​​​​​​​​​​​​​​​​​

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​

EXPLOSION BRECCIA (POLISHED) - Wheal Remfry, St. Austell, Cornwall

« back
Home > MINERALS > UNUSUAL ROCKS AND MINERALS - WEIRD AND WONDERFUL !


'EXPLOSION BRECCIA'
Polished slice

Evidence of a violent, high pressure shattering of rock

Wheal Remfry, near St Austell, Cornwall

The breccia from Wheal Remfry, in Cornwall is one of Britain's most unusual rocks. ​​​​​​​It is thought to originate from hot, molten rock under great pressure deep below the surface.  A sudden release of that pressure - possibly by the molten rock reaching the surface - led to explosive decompression, causing the adjacent rocks to shatter and the mass of hot fluid and rock fragments to surge upwards, rather like champagne being released from a bottle when the cork is removed.  This event occurred about 270 million years ago. 

The fragments are granite and other rocks from great depth. As the pressure fell, the black mineral tourmaline crystallised around the rock debris.  Breccia is the name given to a rock containing fragments cemented together, but few other breccias have been formed in such a dramatic way.

Click on a picture for a larger image


Size: 12 x 9 x 2 centimetres
Weight: 390 grams

PRICE: £25.00
Sorry, this item has been sold or is out of stock
EXPLOSION BRECCIA (POLISHED)  - Wheal Remfry, St. Austell, Cornwall
EXPLOSION BRECCIA (POLISHED)  - Wheal Remfry, St. Austell, Cornwall EXPLOSION BRECCIA (POLISHED)  - Wheal Remfry, St. Austell, Cornwall EXPLOSION BRECCIA (POLISHED)  - Wheal Remfry, St. Austell, Cornwall EXPLOSION BRECCIA (POLISHED)  - Wheal Remfry, St. Austell, Cornwall