The minerals shown in Figure 1.14 are fluorite and topaz that have been tested for hardness using a wire nail. Use the Mohs scale in Figure 1.13 to identify which is fluorite and which is topaz.

Specimen A:

Specimen B:


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Hardness\textbf{Hardness} is one of the most useful diagnostic property which serves as an indicator of the resistance of a mineral to abrasions or scratches. This property is measured by rubbing an unknown hardness material or mineral against a known hardness mineral or material or vise versa. Furthermore, a numerical value can be attained through the Mohs scale of hardness\textit{Mohs scale of hardness}, depending on the material used to scratch the mineral.

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