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Mineralogy Crossword

Across
Softest mineral
Low-T carbon polymorph
Ca-plagioclase
Common Cu-sulphide
Biomineral in bones
Purple quartz
Fe-olivine
Ductile bond
Oldest mineral
Plagioclase substitution
Down
Rock salt
Disordered feldspar
Hard oxide
Ni-bearing sulphide
Pb-sulphide
Biomineral in coral reefs
Fluorescent mineral
Fool's gold
Strong bond
Hardest mineral
Mantle silicate
Na-plagioclase
Soft sulphate