WebThin Section Description: Texture: Hypidiomorphic, with subhedral Kfsp, Plag and mafic minerals, and anhedral Qz. 40% Plagioclase, subhedral, strongly zoned from An 38 in the … WebThe top of the thin section is indicated according to the core orientation. AMPH = amphibole; PLAG = plagioclase; SPH = sphene. 2). Shearing is associated with brecciation; evidence of this comes 2. No apparent offset. from the offset of thin veins that crosscut the chilled margin (PI. 2, 3.

Atlas of Metamorphic Minerals - University of Oxford

http://microckscopic.ro/minerals/silicates/nesosilicates/sillimanite-thin-section/ WebShort prismatic crystals. In thin section: elongate on c- axis, with 4 or 8- sided cross sections; Grains often anhedral; May be granular, massive, columnar or lamellar : Cleavage: Fair to good cleavage on {110} at 87 degrees and 93 degrees. ~90 degree clevage visible in thin section: Pleochroism: x=pale green or bluish green pilot faa notam

Titanite (Sphene) - University of North Dakota

WebPlease note, scale bars are 1cm in hand specimen photographs and 1mm in thin section. Department of Earth Sciences, University of Cambridge: [email protected]: … WebStaurolite is a regional metamorphic mineral of intermediate to high grade. It occurs with almandine garnet, micas, kyanite; as well as albite, biotite, and sillimanite in gneiss and schist of regional metamorphic rocks. Staurolite is quite resistant to weathering but may alter to sericite, chlorite and limonite. WebPyrite in Thin Section Like every other metallic mineral, pyrite is just opaque and black in thin section. However, unlike most other metallic minerals, it can often be identified as pyrite … pilot eyes sunglasses