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TECHNICAL PAPER

MAJOR XRD PEAKS AND OR INTENSITY AND D-SPACING (8.731, 100, 10.11985), (33.852, 46.3, 2.64584) (24.480, 100, 3.63332), (29.379, 99.4, 3.03766) (12.413, 100, 7.12486), (18.666, 96.7, 4.74991) (28.688, 100, 3.10932), (24.832, 86.1, 3.58271) (12.355, 100, 7.15843), (24.856, 69.4, 3.57922) (19.818, 100, 4.47624), (27.721, 70.8, 3.21551) (1.415, 100, 62.40001), (04.245, 04.6, 20.8000) (5.196, 100, 16.99239), (26.201, 01.6, 3.39848) (20.725, 100, 4.28240), (11.634, 90.2, 7.60050) (

OPTICAL PROPERTIES INTERFERENCES IN THIN SECTION Yellow shades to brown to red or green Colourless in thin section- Light shades may be possible Green or greenish brown – or Colourless to pale green Colourless or muscovite interferences Speckled or as earthy mass; white or pale blue or yellow Earthy ground mass – Most often difficult to characterize Earthy ground mass; Pale yellow to brown-varies Colourless to pale or greenish shades of brown Colourless to first order c

INDICATIVE MEAN RI (BIREFRINGENCE) 1.59 (Moderate) 1.58 Moderate) 1.58 (Low) 1.56 (Moderate) 1.56 (Very low) 1.58 (Moderate) 1.50(Moderate) 1.54 (Moderate) 1.52 (Very low) 1.59 (High) 3.10 (Very high) 2.34 (Very high) 2.41 (Very high) 1.78 (None) None (None) None (None) 1.48 (Low) 1.48 (Non) 1.96 (Very high) 1.63 (Very low) 1.62(Low) 1.57(Low) 1.43 (None) 1.74 (None) 1.62 (Low) 1.76 (Very low)

CLEAVAGE / FRACTURE Perfect/ ragged Perfect/elastic Perfect/flexible Perfect/uneven Perfect (not visible)/earthy Perfect (not visible)/earthy Perfect (not visible)/irregular Perfect / uneven Perfect to good/conchoidal Perfect cubic to good/uneven or splintery No cleavage/sub conchoidal No cleavage/sub conchoidal to uneven-brittle No cleavage/sub conchoidal Poor/ sub conchoidal Poor/uneven Poor/uneven Perfect prismatic/uneven Poor/conchoidal Poor/concho

CRYSTAL HABIT Foliated, irregular flaky or pseudohexagonal crystals Books of mica/massive grains, pseudohexagonal Micaceous, foliated and flaky or scaly Coarse to fine scaly grains Fine grained and massive or loose aggregates in pores Prismatic or micaceous Earthy mass Micaceous and lamellar Tabular, elongated, rosettes or sometimes needles Massive, fibrous or granular Massive, botryoidal, earthy or foliated Massive or fine granular or drusy Rhombohedral, prismatic

MINERALS Biotite Muscovite Chlorite Lepidolites Kaolinite Illite Montmorillonite Vermiculite Gypsum Anhydrite Hematite Magnetite Ilmenite Pyrite Pyrrhotite Marcasite Natrolite Sodalite Zircon Apatite Wollastonite Brucite Fluorite Periclase Topaz Corundum

THE INDIAN CONCRETE JOURNAL | AUGUST 2022 11