| P number: | P521495 |
|---|---|
| Caption: | Rock specimen of wollastonite rock. Corntulloch Burn, Aboyne, Aberdeenshire. |
| Description: | The sample is a striking white crystalline rock with a uniform medium-grained granular texture. It is a limestone from the Dalradian which has undergone intense heating to produce a metamorphic rock dominated by the mineral wollastonite. British Geological Survey Petrology Collection sample number EMC 1249. Wollastonite is a calcium-rich pyroxenoid mineral which is found in contact-metamorphosed limestones and commonly occurs in cleavable masses or sometimes as tabular twinned crystals. This particular sample has the original collecting label with the hand-written description 'Limestone largely altered to Wollastonite'. It was presented by George Barrow who was a pioneering geologist in the field of metamorphic petrology. Barrow established his ground-breaking theories whilst undertaking geological fieldwork in the Grampian Highlands of Scotland. In 1893 he established the concept of zones of regional metamorphism; known to this day as 'Barrovian Zones'. Some of the most deformed and metamorphosed rocks of the Dalradian occur in the Aboyne area in Grampian. The Queen's Hill Gneiss Formation comprises dominant migmatitic, semipelitic to pelitic gneisses which are interbedded with psammites, rare quartzites and thin calc-silicate bands. The formation also includes numerous bands of hornblende gneiss, implying that it was once a preferred horizon for the intrusion of basic sheets. Similar migmatitic and gneissose lithologies occur in lower Deeside in a belt between the Hill of Fare and Mount Battock granites. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Unknown |
| Copyright statement: | NERC |
| Orientation: | Landscape |
| Size: | 196.12 KB; 1000 x 775 pixels; 85 x 66 mm (print at 300 DPI); 265 x 205 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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