WJEC Geology GL2 Minerals

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  • Created by: Samantha
  • Created on: 07-10-15 19:16

Quartz

  • Colour - translucent/clear
  • Lustre - vitreous
  • Cleavage - poor
  • Hardness - 7 - harder than fingernail, coin and steel pin
  • Streak - white/scratches plate

 (http://www.healingwithcrystals.net.au/uploads/1/5/5/7/15572098/430425869_orig.jpg?210)

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Calcite

  • Colour - white 
  • Lustre - vitreous
  • Cleavage - perfect in three directions
  • Hardness - 3 - harder than a fingernail and a copper coin.
  • Streak - white
  • Effervescences with hydrochloric acid

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Plagioclase feldspar

  • Colour - white 
  • Lustre - vitreous
  • Cleavage - good in two directions
  • Hardness - 6 - harder than a fingernail, copper coin and a steel pin
  • Streak - scratches plate

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Orthoclase feldspar

  • Colour - flesh pink 
  • Lustre - vitreous
  • Cleavage - good in two directions
  • Hardness - 6 - harder than a fingernail, copper coin and steel pin
  • Streak - white 

(http://www.pelhamgrayson.com/media/images/products/18078_large.jpg)

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Augite

  • Colour - greenish black
  • Lustre - vitreous
  • Cleavage - good in two directions
  • Hardness - 5 to 6 - harder than fingernail, copper coin and steel pin
  • Streak - scratches plate

(http://ecx.images-amazon.com/images/I/81KyJqD0IlL.jpg)

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Hornblende

  • Colour - dark green/black
  • Lustre - vitreous
  • Cleavage - good in two directions
  • Hardness - 5 to 6 - harder than a fingernail, copper coin and a steel pin
  • Streak - scratches plate

(http://lh3.googleusercontent.com/-l8N7bwnoHz8/UTjpBD9x7TI/AAAAAAAAHU0/lfZGvXHowtM/s720/00641%252520IMG_8412%2525206%252520cm%252520hornblende%252520Norra.gif)

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Olivine

  • Colour - olive green
  • Lustre - vitreous
  • Cleavage - none
  • Hardness - 6 to 7 - harder than a fingernail, coin and steel pin
  • Streak - scratches plate

(http://www.mineraltivadar.hu/Mineral/olivine-poland-DSC07813.jpg)

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Biotite mica

  • Colour - brown/black
  • Lustre - vitreous/pearly
  • Cleavage - perfect in one direction forming thin sheets
  • Hardness - 2.5 - not harder than any of them
  • Streak - white

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Muscovite mica

  • Colour - white
  • Lustre - pearly
  • Cleavage - perfect in one direction creating thin sheets
  • Hardness - 2 to 2.5 - not harder than any of them
  • Streak - white

(http://angelstarcreations.com/writings/rocks_minerals/mineral_list_files/image034.jpg)

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Haematite

  • Colour - red/black
  • Lustre - metallic
  • Cleavage - poor
  • Hardness - 5.5 to 6.5 - harder than fingernail, copper coin and steel pin
  • Streak - cherry red 

(http://3.imimg.com/data3/HM/BA/MY-1851909/hematite-iron-ore-250x250.jpg)

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Galena

  • Colour - dark grey
  • Lustre - metallic 
  • Cleavage - good in three directions
  • Hardness - 2.5 - harder than a fingernail
  • Streak - dark grey

(http://www.dakotamatrix.com/images/products/galena23281a.jpg)

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Pyrite

  • Colour - brass yellow
  • Lustre - metallic 
  • Cleavage - none
  • Hardness - 6 - harder than a fingernail, copper coin and steel pin 
  • Streak - greenish black

(http://media-1.web.britannica.com/eb-media/52/100752-004-BC88C7BE.jpg)

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Chalcopyrite

  • Colour - brown yellow
  • Lustre - metallic
  • Cleavage - poor
  • Hardness - 3.5 to 4 - harder than a fingernail and copper coin
  • Streak - black

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Fluorite

  • Colour - colourless/purple/green/yellow
  • Lustre - vitreous
  • Cleavage - good in four directions
  • Hardness - 4 - harer than a fingernail and a copper coin 
  • Streak - white

(http://www.mineralminers.com/images/fluorite/mins/flum101.jpg)

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Barite

  • Colour - white/pink
  • Lustre - vitreous
  • Cleavage - good in two directions
  • Hardness - 3 to 3.5 - harder than a fingernail and copper coin 
  • Streak - white 

(http://3.bp.blogspot.com/-1XePWuMibDE/TyOTv6n4tsI/AAAAAAAAAIg/ycnIRl5BGQ8/s1600/Barytes.jpg)

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Halite

  • Colour - clear/white 
  • Lustre - vitreous
  • Cleavage - good in three directions
  • Hardness - 2.5 - not harder than anything 
  • Streak - white
  • Notable feature - salty taste (also known as rock salt)

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Gypsum

  • Colour - colourless/white
  • Lustre - silky/pearly
  • Cleavage - good in one direction
  • Hardness - 2 - not harder than anything
  • Streak - white
  • Notable feature - fibrous

(http://paganpages.org/content/wp-content/uploads/2012/12/gypsum-kungur.jpg)

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Andalusite

  • Colour - grey/pink
  • Lustre - vitreous
  • Cleavage - poor in one direction
  • Hardness - 7.5 - harder than a fingernail, copper coin and a steel pin
  • Streak - scratches plate

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Garnet

  • Colour - red/brown
  • Lustre - vitreous 
  • Cleavage - none
  • Hardness - 6.5 to 7.5 - harder than a fingernail, copper coin and a steel pin 
  • Streak - scratches plate

(http://skywalker.cochise.edu/wellerr/mineral/garnet/6garnet-almandite172f.jpg)

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Chlorite

  • Colour - green
  • Lustre - pearly
  • Cleavage - good in one direction
  • Hardness - 2 - not harder than anything
  • Streak - white 

(http://nevada-outback-gems.com/mineral_information/Chlorite03.jpg)

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