| P number: | P528028 |
|---|---|
| Caption: | Photomicrograph of limestone. Light: XPL. Magnification: x2.5. 650 yards north 18 degrees east of outflow of Lochan Druim na Fearna, Rossshire, Scotland. |
| Description: | A crystalline calcareous dolomite, foliated and with greenish laminae, and traversed by pinkish ferruginous streaks and cracks. This specimen is Lewisian (Precambrian) in age. BGS sample number SL 263. British Geological Survey Petrology Collection sample number S 35270. Photomicrograph details: Light: XPL, Magnification: x2.5. The sample is composed of interlocking grains of twinned and cleaved dolomite slightly elongated in the direction of foliation, with finely granular calcite on the periphery, in irregular spaces within the dolomite grains and in irregular laminae through the rock. Phlogopite, partly chloritized, tremolite and quartz are subordinate minerals and are elongated in the direction of foliation. Colourless tourmaline and apatite are accessory, and a little rutile is present in small aggregates of irregular deep brown grains. Limonitized iron ore is intergrown locally with mica. The rock is a calcareous dolomite containing phlogopite, quartz and tremolite. It is medium-grained, and has a foliated and strained texture. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 346.70 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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