| P number: | P527942 |
|---|---|
| Caption: | Photomicrograph of limestone, Sandend Group. Light: XPL. Magnification: x2.5. Hillockhead Quarry, 2.5 miles west by south of Keith, Banffshire, Scotland. |
| Description: | Dove-grey, medium-grained crystalline limestone. This specimen is Dalradian Supergroup (Precambrian) in age. BGS sample number SL 72. British Geological Survey Petrology Collection sample number S 34512. Photomicrograph details: Light: XPL, Magnification: x2.5. The sample is composed of interlocking grains of closely twinned calcite, 0.5 to 2 mm grain size, with numerous small quartz grains at the junctions of the calcite grains. Locally large grains of quartz are elongated along the foliation. Muscovite is a subordinate mineral. Sphene, apatite and graphite are accessory; zoistic epidote is present in some laminae. In summary the rock is a limestone with quartz, muscovite and zoisite. It is coarse-grained, granoblastic, and foliated. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 285.84 KB; 1000 x 663 pixels; 85 x 56 mm (print at 300 DPI); 265 x 175 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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