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Scheelite:
- A calcium tungstate mineral
- An important ore of tungsten
- Forms during contact metamorphism and in hydrothermal veins
- Named after Carl Wilhelm Scheele (1742-1786), a Swedish chemist #minerals
Scheelite:
- A calcium tungstate mineral
- An important ore of tungsten
- Forms during contact metamorphism and in hydrothermal veins
- Named after Carl Wilhelm Scheele (1742-1786), a Swedish chemist #minerals
Pyrolusite:
- Mineral form of manganese dioxide
- A very common manganese mineral
- An important manganese ore
- Used as a pigment in ancient cave paintings
- Forms in oxidised manganese-bearing hydrothermal deposits #minerals
Pyrolusite:
- Mineral form of manganese dioxide
- A very common manganese mineral
- An important manganese ore
- Used as a pigment in ancient cave paintings
- Forms in oxidised manganese-bearing hydrothermal deposits #minerals
Smoky Quartz:
- A grey to black variety of quartz
- Its colour is due to a combination of Al3+ replacing Si in the crystal lattice and gamma irradiation
- Its colour fades when exposed to UV light and heat
- Forms in igneous rocks #minerals
Smoky Quartz:
- A grey to black variety of quartz
- Its colour is due to a combination of Al3+ replacing Si in the crystal lattice and gamma irradiation
- Its colour fades when exposed to UV light and heat
- Forms in igneous rocks #minerals