EESA06H3 Lecture 4: EESA06 Lec4
Document Summary
Igneous rocks = born of re, from magma solidifying. >a mineral is a homogenous solid formed through geological processes; is usually highly ordered atomic structure (crystalline), have speci c physical properties. (note: ice is a mineral), can be pure elements or complex silicates. Are important in identifying rocks because ether all look different. Know composition 4 minerals (two types of feldspar, quartz, and biotite) >one of the building blocks of rocks are a large group of minerals called silicates (almost all of them) >mica is made up of silicates (phylosilicates) used in makeup and paints. >calcite is made up of carbonates (common in sedimentary rocks) Colour (is a very bad way to identify minerals because the same mineral comes in a range of colours) Streak test- ground the mineral on a streak plate made of porcelain tile (silicates do not. Hardness (classi ed by moh"s hardness scale of 1-10 in increasing hardness)
