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Ian Geoffrey Stimpson / 265 items
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Day 69 : Rhodonite, a manganese inosilicate, (Mn, Fe, Mg, Ca)SiO3, from Ekaterinburg, Urals, Russia. Keele Cotton Collection.

Tags:   Rock365 geology rhodonite

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Day 68 : Working from home so a boulder from the back garden collection today. It is from the Devonian of Pembrokeshire, Wales and is red siltstone with calcium carbonate nodules. I'm uncertain if the calcium carbonate is a 'primary' caliche or if they have been reworked to form a conglomerate.

Tags:   Rock365 geology

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Day 67 : These are olivine-rich mantle xenoliths in a basalt. The sample was one of the first I collected as an A-level geology student many years ago from the Carboniferous volcanic vent at Calton Hill, near Buxton on the edge of the Peak District. Since I collected this sample much of the quarry has been in-filled with domestic refuse and what exposure remains is heavily weathered. Fresh samples like this are hard to obtain now.

Tags:   Rock365 geology mantle xenolith

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Day 65 : An open weekend at Keele so more samples from our open day displays. This is tourmaline, probably from Cornwall.

Tags:   Rock365 geology Tormaline


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