Earth Sciences 1022A/B Study Guide - Final Guide: Siltstone, Mafic, Muscovite
23 Feb 2014
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Crystal form: external shape equant- equidemenional (cube) tabular- at tablet shaoed columnar or prismatic- elongated acicular- extremely elongated or needle-like. Opaque- all light is re ected (metallic minerals) translucent- some light is absorbed (most minerals) transparent- mo! Ngernail: 2. 5 penny: 3 knife: 5. 5 glass: 6. Ceramic plate: 7 felsic- lighter the rock ma c- darker the rock intermediate- composition between felsic and ma c ultrama c- produces only ferromagnesian (super dark) Alluvial fans: stream deposits near the base of mountains (poorly sorted- breccia) basal: single cleavage diretion. 3 cleavage directions at right angles rhombohedral: 3 cleavage directions not at right angles no cleavage. Fluvial environment: river deposits of well sorted sediments (shale) Eolian environment: wind deposits which are well rounded and very well sorted and normally cross blended (sandstone) Glacial environment: very poorly sorted with subangular to sub rounded grains (tillite) Deltas: complex environment where thick accumulations of (siltstone, sandstone and shale may be deposited )
