Caja de dureza mineralógica / mineralogical hardness box
€19.95
Caja con diferentes minerales para determinar la dureza de los cristales.
Contiene: Talco, Yeso, Calcita, Fluorita, Apatita, Ortesis, Topasa, Corindón y Diamante (¡Diamante real!)
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Box with different minerals to determine the hardness of crystals.
Contains: Talc, Gypsum, Calcite, Fluorite, Apatite, Orthose, Topase, Corindon and Diamant (real diamant!)
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