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Monzogranite – Biotite granite rocks that are considered to be the final fractionation product of magma – A silica-undersaturated granite with <5% normative quartz; Monzonite – Igneous intrusive rock with low quartz and equal plagioclase and alkali feldspar – a plutonic rock with <5% normative quartz
The granite of the dimension-stone industry along with truly granitic rock also includes gneiss, gabbro, anorthosite and even some sedimentary rocks. Natural stone is used as architectural stone (construction, flooring, cladding, counter tops, curbing, etc.) and as raw block and monument stone for the funerary trade.
When cut and polished, Morton gneiss shows bands and swirls of black, pink, and gray, with white flecks that sometimes look like galaxies and nebulae floating in space. The rock's colors come from quartz (white), potassium feldspar (pink), plagioclase feldspar (light gray), and biotite and amphibole (black.) [ 2 ]
Granite (light) with sheeted veins of greisen (dark) at Cligga Head, Cornwall. Greisen is a highly altered granitic rock or pegmatite, usually composed predominantly of quartz and micas (mostly muscovite). Greisen is formed by self-generated alteration of a granite and is a class of moderate- to high-temperature magmatic-hydrothermal alteration ...
Coarse-grained pinkish to reddish granite [10] Coarse-grained gray to black granodiorite [10] Fined-grained pinkish to gray granite [10] Black Dolerite [10] Some of the monuments known to come from this site are: Cleopatra's Needle; The unfinished obelisk still on site, at the northern quarry [15]
Gabbro is known in the construction industry by the trade name of black granite. [31] However, gabbro is hard and difficult to work, which limits its use. [32] The term "indigo gabbro" is used as a common name for a mineralogically complex rock type often found in mottled tones of black and lilac-grey.
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