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Sandatlas is an educational blog primarily focusing on geological materials: rock types, minerals, and sand. Most blog posts are illustrated with lots of relevant and original pictures.
Eclogite is a metamorphic rock consisting of pyroxene omphacite and pyrope-rich garnet. Eclogite is a rare but geologically significant rock type. It is common in the upper mantle, especially in regions occupied by subducted oceanic plates. Eclogite is unusually dense for a silicate rock (3.4–3.5 g/cm3) which suggests that very high pressure was involved in [...]... Read more »
Rapp, R. P., Watson, E. B., & Miller, C. F. (1991) Partial melting of amphibolite/eclogite and the origin of Archean trondhjemites and tonalites. Precambrian Research, 51(1-4), 1-25. DOI: 10.1016/0301-9268(91)90092-O
Oolite is a sedimentary rock made up of ooids (ooliths) that are cemented together. Most oolites are limestones — ooids are made of calcium carbonate (minerals aragonite or calcite). Ooids are spheroidal grains with a nucleus and mineral cortex accreted around it which increases in sphericity with distance from the nucleus. Nucleus is usually either [...]... Read more »
Heikoop, J. M., Tsujita, C. J., Risk, M. J., Tomascik, T, & Mah, A. J. (1996) Modern iron ooids from a shallow-marine volcanic setting: Mahengetang, Indonesia. Geology. DOI: 10.1130/0091-7613(1996)024
Sturesson, U., Dronov, A., & Saadre, T. (1999) Lower Ordovician iron ooids and associated oolitic clays in Russia and Estonia: a clue to the origin of iron oolites?. Sedimentary Geology. DOI: 10.1016/S0037-0738(98)00112-2
Dolomite or dolostone is a carbonate sedimentary rock containing more than 50% by weight of the mineral dolomite1. Dolomite rock may contain calcite but the content of calcite should not exceed 10% of the calcite-dolomite pair’s content3. There is a considerable amount of confusion over the name of this rock. The problem is that dolomite [...]... Read more »
Shungite is a carbon-rich metamorphic rock. Shungite is largely consisting of carbon, up to 98% in some cases but interesting fact is that this carbon is not mineral graphite. Shungite is believed to be a metamorphosed oil shale. The most famous locality where large shungite deposit is found is in Karelia, near Shun’ga village (hence [...]... Read more »
Melezhik, V. A., Fallick, A. E., Filippov, M. M., & Larsen, O. (1999) Karelian shungite—an indication of 2.0-Ga-old metamorphosed oil-shale and generation of petroleum: geology, lithology and geochemistry. Earth-Science Reviews, 47(1–2), 1-40. DOI: 10.1016/S0012-8252(99)00027-6
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