Minerals
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This document discusses the properties of minerals. It defines a mineral as a naturally occurring inorganic solid with a characteristic internal structure and definite chemical composition. It then describes several key mineral properties - color, lustre, cleavage, hardness, and streak. Examples are provided for common minerals like quartz, feldspar, calcite, halite, and micas, noting the typical values for each property in these minerals. The document serves to introduce the main properties used to identify and describe minerals.
Minerals
- 2. What is a mineral ? A mineral is a A mineral is a naturally ocurring ,inorganic, solid which possesses a characteristic internal atomic structure and definite chemical composition Examples of minerals
- 3. What is a rock A rock is a natural solid composed of multiple crystals of one or more minerals Examples of rocks
- 4. Colour:Is the first thing someone notices when they view a mineral. Lustre: is a description of the way light interacts with the surface of crystal. Cleavage: when a mineral breaks it does so either by fracturing or by cleaving. Hardness: a good property in mineral identification the hardness. Streak: often demonstrates the true or inherent their color variable. The name of the propertys of minerals and the description of the property
- 5. Special terminology used to describe this property Colour: yellow, bronw, blue, red, gray, purple, orange... Lustre: crystal habit, index of refraction. Cleavage: good, distinct, cubic, octahedral, perfect. Hardness: weak, strong. Streak:milky, smoky pink, smoky.
- 6. This propertys in some minerals MINERAL:QUARTZ COLOUR:White, Purple, Pink , Smoky LUSTRE:Criptocrytolline,waxy can be vitreous CLEAVAGE:Is very weak (rhombohedral) HARDNESS: 7 STREAK:Is white INTERESTING:Silica for glass,Electical components,Optical lenses, Abrasives
- 7. This propertys in some minerals MINERAL:QUARTZ COLOUR:White, Purple, Pink , Smoky LUSTRE:Criptocrytolline,waxy can be vitreous CLEAVAGE:Is very weak (rhombohedral) HARDNESS: 7 STREAK:Is white INTERESTING:Silica for glass,Electical components,Optical lenses, Abrasives
- 8. This propertys in some minerals MINERAL:FELDESPAR COLOUR:WHITE , GRAY ,or colorless can be pale stades of other colors LUSTRE:Is vitreous to dull if weathered CLEAVAGE: Is perfect in one and good direction forming nearly right angled prism HARDNESS: 6- 6,5 STEAK:Is white INTERESTING: Only as mineral speciem c
- 9. This propertys in some minerals MINERAL:CAlCITE COLOUR:YELLOW,ORANGE,BLUE, PINK , BRONW, GREEN, BLACK AND GRAY LUSTRE:Is vitreous to resinous to dull in massive form CLEAVAGE:Is perfect in three directions, forming rhombohedrons HARDNESS: 3 STREAK: Is white INTERESTING: In cements and mortars
- 10. This propertys in some minerals MINERAL:HALITE COLOUR:Is clear or white but can be found Blue , Purple , Pink, Yellow and Gray LUSTRE:Is vitreous CLEAVAGE: Is perfect in three directions forming cubes HARDNESS:2 STREAK:Is white INTERESTING: Major source of salt and as mineral specimens
- 11. This propertys in some minerals MINERAL: MICAS COLOUR: Is White, Silver, Yellow, Green, Bronw LUSTRE: Is vitreous to pearly CLEAVAGE:Is perfect in one direction producing thin sheets or flakes HARDNESS: 2- 2,5 STREAK: Is white INTERESTING: Heat and Electrical insultator for industrial purposeses