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a test showing when dilute acid (HLC) is placed on a mineral, it may bubble

calcite and dolomite both react with acid

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an irregular or uneven break

tends to lack preferred zones of weakness

for example: fibrous; conchoidal

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the tendency of a mineral to break along weak areas and form semi-smooth or parallel surfaces.
-can break in one direction or 3 directions (90 angles)

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resistance of a mineral to being scratched

MOHS Hardness Scale is used to classify hardness

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The ratio of mass and volume of an object.
formula- D=M/V
work- D=350 G/35 ML
answer- D=10 G/ML

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the shine of an unweathered mineral; the way it looks reflected in light.
Two Types of Luster

metallic luster: shines like stainless steel (metal)

nonmetallic luster: earthy or dull shine

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the color of a finely-crushed powder when a mineral is dragged across a streak plate.

weathering changes the outside color, but streak gives the true color.

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a visual attribute of an object based on perception.

one of the most obvious, but not the most reliable

many of the 4000 known minerals share similar colors