| P number: | P527937 |
|---|---|
| Caption: | Photomicrograph of Lismore Limestone. Light: XPL. Magnification: x2.5. Quarry just north of Port Ramsay, Argyllshire, Scotland. |
| Description: | A dark grey, rudely flaggy limestone with a set of rectangular narrow calcite veins normal to the bedding. This specimen is Dalradian Supergroup (Precambrian) in age. BGS sample number SL 88. British Geological Survey Petrology Collection sample number S 34483. Photomicrograph details: Light: XPL, Magnification: x2.5. The rock is composed essentially of elongated grains of calcite darkened with dust, possibly graphitic, and containing subordinate alkali-feldspar and quartz. The calcite is of varying grain size reaching 0.5 mm in length and is elongated parallel to the flagginess. A subordinate proportion of the calcite shows biaxiality. Apatite and tourmaline are accessory minerals in the rock, and pyrite is common in euhedral crystals reaching 2 mm across. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 419.00 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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