NAVIGATION
Potassium chloride crystal optic disc, 13mm x 2mm, unpolished
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Potassium chloride crystal optic disc, 25mm x 5mm, unpolished
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Potassium chloride crystal optic disc, 32mm x 3mm, unpolished
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Potassium bromide crystal optic disc, 25mm x 5mm, unpolished
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Potassium bromide crystal optic disc, 32mm x 3mm, unpolished
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Sodium chloride crystal optic rectangle, 30mm x 15mm x 4mm, unpolished
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