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.
|Blue Polar, Rasputin, Russischer Labrador|
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.
|Petrographic assignment||Anorthosite (Plutonite)|
|Age||600 million years (Pre-Cambrian)|
|Colouring minerals:||Blue-grey / green-black feldspar, black pyroxene, black-green olivine|
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.
Petrology:A very coarse-grained, dark blue-grey anorthosite consisiting of blue-black feldspar. Anorthosite: A phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar (90-100%), and a minimal mafic component (0-10%). Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present. The surface shimmers with blue-green flashes as viewing angle and lighting change. Black pyroxene, black-green olivine and silvery flakes of magnetite ore are interspersed with the crystals.
Petrogenesis:Consists predominantly of labradorite. Over millions of years cooling the magma crystallised into large, coarse grain plutonic rock.