granite Archives - Geology Superstore

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Biotite Granite £1.38 – £3.46 ex VAT
Specimen Size
2" x 2"3" x 2"4" x 3"
Biotite granite igneous rock specimens from Ballachulish, Scotland, UK. Composed of the felsic minerals quartz and feldspar, with occurrences of biotite crystals. The rock has an overall white appearance due to its felsic chemistry but the black biotite mica offers a striking contrast in colours. The samples are ideal for both collectors due to the attractive nature and for college to university level education to describe the variations in granite which one may find. The samples are available in three sizes and supplied in a card tray with an information label.

75 in stock
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Biotite Muscovite Granite
Biotite muscovite granite specimens from St. Austell in Cornwall, UK of Permian age is a coarse grained igneous rock composed of quartz, plagioclase feldspar, biotite and muscovite. The rock is part of the St. Austell pluton which formed 280 million years ago. An off white colour with gold and black flecks of micas, the rock has a unique chemistry and resulted in the rich mineralisation of ores in the area. The samples are suitable for collectors and educational use to show granite variants, available in three sizes. Each piece will come supplied in a card tray with an information label.

81 in stock
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Lepidolite in Quartz (Scotland) £2.07 – £2.88 ex VAT
Specimen Size
1.5" x 1.5"2" x 2"
Specimens of milky quartz containing small amounts of lepidolite mica from Glen Gairn, Strathdon, Aberdeenshire, Scotland. These samples of quartz contain a pale lilac lepidolite mica which has a massive form. These pieces, ideal for British mineral collectors, are supplied in a white card tray with an information label.
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Quartz Monzonite £1.27 – £3.57 ex VAT
Specimen Size
2" x 2"3" x 2"4" x 3"
Quartz monzonite igneous rock specimen from Ratagan, Scotland. Associated to granites, yet containing only 5% to 20% quartz, making it a monzonite, these intrusive felsice rocks are igneous in origin and are available in different sizes, supplied in a white card tray with a label.

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