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Graphic pegmatit with polished sideStone:Graphic Granite / Graphic PegmatiteDiameter:Approximately 185 mmWeight:About 1610 gOrigin:Ukraine, Zhytomyr Oblast, Khoroshivskyi (Volodarsko-Volynskyi) district, Volodarsk-Volynsk pegmatite field (Volodarsk-Volynskyi, Volyn deposit).
Natural irregularities and inclusions may be present in the stone.
You will receive the exact specimen shown in the photos.
PEGMATITE
Pegmatite is a coarse- to giant-crystalline igneous rock occurring as veins and pockets within mainly magmatic, less commonly metamorphic, and rarely sedimentary rocks.
PropertiesMorphology
Pegmatites typically occur as veins of varying sizes and shapes, cutting through host magmatic, metamorphic, or sedimentary rocks. They usually have sharp contacts with the surrounding rock. Pegmatite veins can be several hundred meters thick and several kilometers long, often extending more than 1 km deep.
Pegmatites form plate-like, lens-like, or columnar bodies. Vein-type pegmatites often cluster into pegmatite fields, which can span tens of square kilometers and contain from dozens to thousands of individual veins.
Formation
There are various theories on the formation of pegmatites. They form from residual magma enriched with volatile components during prolonged crystallization, resulting in sequential mineral associations at different stages of the process. In the final stages of pegmatite formation, replacement processes significantly influence the minerals already formed.
In addition to magmatic differentiation, the emanation process plays a vital role in pegmatite formation. Emanations contribute to the accumulation of volatile compounds in the upper parts of intrusive bodies, leading to the formation of diverse pegmatites and the secondary "distillation" of volatiles during the intrusion of pegmatitic melts/solutions into the host rocks.
Alternative theories suggest that pegmatites can form through metasomatic processes, involving the recrystallization of fine-grained magmatic parent rocks under the influence of post-magmatic hydrothermal solutions.
Applications
Pegmatites are a critical source of:
