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Model to show how layer lines originate
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Section of mine roof coloured with deposits of Copper mineral,...
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A brown crystal with fern-like growths
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A potato stone side on
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A potato stone open side forward
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A black stone covered in sal ammoniac crystals
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A siderside crystal containing Quartz and Chalopyrite or Chalc...
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A white stone with a blue stripe
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A purple rock with small yellow copper strips
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A group of artificially made crystal
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A pink and white crystal boule
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'Agate-lined geode...'
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Brightly coloured rocks seen at Solfatara by Lord Hamilton and...
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A drawing of a rock with crystals coming out of it.
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