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The early history of the mineral schorl shows that the name "schorl" was in use prior to 1400 because a village known today as Zschorlau (in Saxony, Germany) was then named "Schorl" (or minor variants of this name), and the village had a nearby tin mine where, in addition to cassiterite, black tourmaline was found.
Tourmaline-feldspar-quartz from the Cretaceous of Namibia. (~2.45 cm across at its widest) Black = schorl tourmaline Light-colored material - microcline feldspar and quartz This is a schorl tourmaline-rich sample from the Erongo Granite of Namibia. The Erongo Granite is a subvolcanic ring dike granite.
Tourmaline-feldspar-quartz rock, Mt. Erongo. This is a schorl tourmaline-rich sample from the Erongo Granite. The Erongo Granite is a subvolcanic ring dike, above an old volcano. Mount Erongo (21º37'S 15º40'E) is a mountain of 2,350 metres northeast of Swakopmund in Erongo Region, Namibia.
Elbaite forms three series, with dravite, with fluor-liddicoatite, and with schorl. Due to these series, specimens with the ideal endmember formula are not found occurring naturally. As a gemstone , elbaite is a desirable member of the tourmaline group because of the variety and depth of its colours and quality of the crystals.
Roche Rock Roche Chapel. Roche Rock (Cornish: An Garrek) stands out as a rocky outcrop some 20 metres (66 ft) high on the northern flank of the St Austell granite with an approximate area of 600 metres (2,000 ft) x 300 metres (980 ft).) [4] The rock is of interest to geologists as it is a fine example of quartz schorl; a fully tourmalinised granite, with black tourmaline crystals.
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A typical sequence of deposition begins with microcline and quartz, with minor schorl and garnet. This is followed by deposition of albite, lepidolite, gem tourmaline, beryl, spodumene, amblygonite, topaz, apatite, and fluorite, which may partially replace some of the minerals in the earlier zone. [5]
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