Porphyry - Tumbled Stone

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Porphyry - Tumbled Stone
Porphyry is a general name for igneous rocks that contain phenocrysts, especially if the phenocryst mineral is also found in the smaller crystals of the groundmass. It is most often used for rocks with a fine to medium-grained groundmass, that have formed in minor intrusions or lava flows. The term Porphyry is often prefixed.
This can be a reference to the minerals it contains, such as quartz-feldspar-porphyry, which contains those two minerals as phenocrysts.
Alternatively, it can refer to the composition, such as rhyolite porphyry, or texture, such as rhomb porphyry. The latter contains feldspars with rhombic cross-sections.

Porphyry tumbled to a smooth finish, an ideal pocket size stone, small enough to carry around with you. Tumble Stones can also be placed around the home for their energies or can just be nice decorative items.

Porphyry crystal gemstones of varying sizes selected specially for your order.

Size approximately   2 - 3 cm

Here at London Fossils Crystals I sell a wide range of Tumble Stones  

Tumble stones are so called because a number of stones of similar sizes are placed in a barrel which is rotated (tumbled) at a speed and after a time between 3 - 5 weeks the stones are polished from rough to smooth. 
(The Tumble stones we sell, have not been tumbled by ourselves)