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TECHNICAL PAPER

ACCESSORY MINERALS Orthoclase, biotite, augite, and hornblende. - Biotite, clinopyroxene, olivine, and quartz. Biotite, pyroxene, and amphibole. Glass. Quartz. Biotite or hornblende. Zircon. Biotite and amphibole. Hornblende, biotite, and magnetite. Hornblende, biotite, and magnetite. Chalcopyrite, hornblende, apatite, pyrrhotite, serpentine, calcite, biotite and chlorite. Magnetite, hornblende, ilmenite, and biotite. Hornblende, biotite and magnetite. Biotite, muscov

MAJOR MINERALS Quartz and plagioclase. Quartz and alkali feldspar. Alkali feldspar and plagioclase. Plagioclase. Pyroxene (augite), plagioclase, and olivine. Magnetite, pyroxene, plagioclase and biotite. Quartz, plagioclase, and alkali feldspars. Feldspar, augite and hornblende. Pyroxene (augite), plagioclase, and olivine. Alkali feldspars, plagioclase, and quartz. Alkali feldspars, plagioclase, and quartz. Plagioclase, clinopyroxene (augite), olivine, magnetite and limonit

INDICATIVE COLOUR Igneous Light Light gray, red Light Bluish gray Dark gray to black Dark – varies Light to white Pale, white to brown Dark or reddish brown Light or dark to black Light or dark to black Dark gray/green to black Dark gray/ greenish to black Light or dark to black Pink or white to dull grey Light Speckled black and white Mix of light and dark Dark green to black Dark Light to dark Light to dark Gray to black Reddish brown Light

Table 2: Common rocks and their mineralogy [1, 7-11, 15-18]

Aphanitic to porphyritic Aphanitic or porphyritic Aphanitic or porphyritic Forthy, micro-vesicular, pyroclastic Forthy or pyroclastic Granophyric- intergrowing- radiating Diabasic or ophitic Granular and phaneritic (hypidiomorphic) Pegmatitic coarse crystalline Phaneritic (medium to coarse grained) Phaneritic (medium to coarse grained) Hypidiomorphic (granular to inter granular) Non-clastic-microcrystalline Crystalline/ clastic/ massive /granular Earthy or f

TEXTURE Porphyritic Felsic Porphyritic Glassy Porphyritic Ophitic Phaneritic Phaneritic Clastic Clastic Clastic Clastic Clastic Clastic Clastic Clastic Earthy Earthy Earthy Foliated Granular Granular Granular Highly foliated Highly foliated

ROCK Rhyolite Felsite Trachyte Andesite Basalt Obsidian Perlite Pumice Scoria Microgranite Granophyre Diabase Dolerite Granite Pegmatite Syenite Diorite Norite Gabbro Peridotite Conglomerate Orthoquartzite Greywacke Arkose Chert Claystone Siltstone Argillite Shale Limestone Dolomite Marl Chalk Tillite Laterite Genies Marble Hornfels Quartzite Schist Slate Phyllite

Extruded volcanic (Microcrystalline) Shallow Intruded (medium grained) Deeply intruded - (coarse crystalline) Metamorphic

ORIGIN - Hypabyssal Plutonic Sedimentary

8 THE INDIAN CONCRETE JOURNAL | AUGUST 2022