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Rhomb Porphyry

Biotite Muscovite Granite

£1.73 – £3.46 ex VAT

Bytownite Basalt

£1.73 – £3.98 ex VAT

£1.38 – £3.46 ex VAT

An igneous rock exhibiting a porphyritic texture containing large cubic crystals of feldspar within a fine grained matrix. Collected near Oslo, Norway. Each sample is supplied in a labelled card tray. Each sample is supplied in a labelled card tray.

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Rhomb porphyry is an porphyritic alkaline syenite composed of an alkali feldspar groundmass with augites having rhombohedral cross sections as the principal phenocryst minerals. It is formed when a column of rising magma is cooled in two stages. The first deep in the crust creating the larger crystals with a diameter of 2mm or more. In the final stage at much shallower depths or during ejection from a volcano the cooling is rapid creating the much finer matrix. Traditionally the term “Porphyry” refers to the purple- red form of this stone prized in antiquity for it’s hardness & excellent building qualities particularly in Ancient Rome. This rock specimen is available in various optional sizes as well as in a 3″ size piece with a cut and lacquered face to detail the crystal structure of the rock in much clearer detail.

Weight 130 g
Specimen Size

2" x 2", 3" x 2", 4" x 3"

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Rhomb Porphyry (1kg) £5.00 ex VAT

An igneous rock exhibiting a porphyritic texture containing large cubic crystals of feldspar within a fine grained matrix. Collected near Oslo, Norway. Each sample is supplied in a labelled card tray. Specimens are supplied in a polythene bag in lots of 1 kg with a label.

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Rhomb porphyry Slide £18.00 ex VAT

Rhomb porphyry thin section exhibiting the textbook porphyritic texture of this rare igneous rock. The thin section shows a fine grained alkali feldspar groundmass with large phenocrysts of augite. This material was collected near Oslo in Norway.

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