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filled with sparkling quartz crystals
an extinct species of ancient ammonoid cephalopod
and rich green hue
depending on the surrounding rock (typically limestone or shale)
Mohs Hardness Scale Rock Kit sold-out-hidden filled with sparkling quartz crystalsSize: 21 x 14 cms Weight: 38 grams (Avg) Location: Made in USA Product Description: This educational collection showcases the 10 minerals that comprise Mohs Hardness Scale, a fundamental tool for geologists and mineralogists. Each mineral specimen is carefully selected and labeled to illustrate its corresponding hardness rating, from 1 (softest) to 10 (hardest). The collection includes: 1. Talc (Mohs hardness: 1) 2. Gypsum (Mohs hardness: 2) 3.
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