Synonyms Stones can have many aliases. This is due to language differences, supplier choice, coloquial trends or slang, or sometimes errors and ambiguity between rocks. Read more here. |
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Category Commercial classification sometimes differs to the scientific, geological designation. In particular, some limestones are deemed marble especially if they take a high polish. Read more here. |
Granite |
Petrographic assignment | Gneiss – Paragneiss |
Age | 700 million years (Pre-Cambrian) |
Colouring minerals: | White feldspar, grey-transparent quartz, black biotite, silvery muscovite, spots of brownish pyrite (haematite) |
Average hardness MOHS is the standard scale of hardness for minerals 1-10, with 10 being the MOHS of diamond. We also use the broad terms Hard and Soft for simplicity. Read more here. |
6 (Hard) |
Origin | USA |
The images of each stone aim to give a faithful representation of the structure and colouring. The close-ups are generally taken from a sample around 100mm in height to get the detailing of the grain and crystals. The slab images are usually between 2000x1000mm and 3000x1900mm approximately, to give a more overall picture of the pattern.
This is for guidance only, when seeking a specific pattern and colour matching, please obtain a sample or arrange for the slab to be viewed in person. When placing the order, you may require a photo of the actual slab before production, the colour and character can vary significantly even throughout the same block within natural materials. Also monitor calibration, camera settings and lighting can all effect how the materials are perceived.
A fine-grained, grey to white-grey gneiss (paragneiss) of the Precambrian period with cloudy decoration, partly with pyrite and hematite.
The veining and colour varies considerably and a small sample may not be representative of the whole slab.
Popular and typical usage
Petrology:Bright grey and white crystal paragneiss with an irregular cloudy pattern. Mainly composed of white feldspar and transparent quartz; black biotite streaks, some silvery muscovite and greenish epidote give the ornamentation. Clouds, folds and waves feature throughout.
Petrogenesis:Paragneiss; generated through metamorphosis of former sediment rock as a result of tectonic activities between the earth’s crust and mantle. There it re-crystallised, the mica minerals have been generated from the clay elements of former sediments.
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