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Mineral ID
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Definition Naturally occurring Solid Inorganic Crystalline form
Definite chemical composition More than 4000 know minerals
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Mineral Properties Luster Hardness Streak Color Crystal
Cleavage/Fracture Other
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Luster - Metallic Cube – pyrite Bubbled - hematite
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Luster - Nonmetallic Kaolinite – white Limonite - rust
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Hardness Test Scratch a mineral with either another mineral or field test materials. The harder mineral will leave a mark or cut into the softer mineral. Field Test Try to scratch with Fingernail - if so, 2.5 if not, Copper Penny – if so, 3 Steel Nail – if so, 5 Glass Plate – if so, 5.5 Streak Plate – if so, 7.5 if not, > 7.5
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Very soft minerals White – kaolinite – sticks to tougue, feels dry and powdery Whitish pink – talc – feels smooth Dark gray – graphic – feels smooth, rubs off on fingers
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Very hard minerals Clear – diamond
Hexagonal – corundum (red: ruby, blue: sapphire)
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Streak Rub the mineral across the porcelain plate. The color left behind is the streak. Nonmetallic minerals and those that have a hardness greater than the streak plate will leave either white or no streak.
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Cleavage vs. Fracture Sheets – mica: biotite (black – dark brown) and muscovite (light colored) Pink – orthoclase feldspar
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Fracture Fracture
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Crystal vs Fracture - Quartz
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Crystal vs Cleavage - Galena
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Twinning - Staurolite Back
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Color - Quartz
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Color - Calcite
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Other Crystal (galena) (pyrite) (fluorite) (quartz) Twinning(staurolite) Fluorescense (fluorite) HCl Acid Reaction (calcite) Heft (galena) Magnetism (magnetite) Plasticity (mica) Smell (sulfur) Sound: actually a reaction to heat expansion (sulfur) Taste (halite) Touch (talc) (graphite) (kaolonite)
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Crystal Shape - Quartz
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Crystal Shape - Pyrite
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Crystal Shape - Fluorite
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Crystal Shape - Wavellite
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Fluorescent Mineral Gallery
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HCl reaction
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Heft Galena Barite rose
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Magnetism
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Plasticity
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Smell
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Sound - Sulfur
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Touch – feel dusty, slick and soapy
White – kaolinite – sticks to tougue, feels dry and powdery Whitish pink – talc – feels smooth Dark gray – graphic – feels smooth, rubs off on fingers
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Diamond
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Earth Science Lab ID of an Unknown Mineral ID Key online
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Rockhounding Arkansas The Science Spot Kid Zone
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Minerals Make Up Rocks
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Rocks are made from minerals!
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