Optical Calcite - Bulk Mineral Reviews

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I contacted this company and asked for the three rock pieces listed and shown in picture. They have now sent the additional calcite. There is fine print in this add indicating this is for 1 piece only. The company has fixed the problem. Originally we were sent only one piece. This is good calcite, 1 inch pieces approximately that are see through and have some double refractory properties depending on how you hold them to the light.

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After purchasing this product it was just as good as I had hoped, very clear and of good size. Also a little extra was included in the order which was amazing lol. Very good seller.

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This really works for figuring out how Vikings used it to navigate by sun. The image seems to be exactly what I ordered. If I were to depend on this for navigation, I'd seek one with more clarity and less optical anomalies, but this will certainly work in an emergency.

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Was just what it said it would be! Its Calcite! Can be used a sunstone or a magnifying glass. Its about that size too.

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XUmp Science was great in resolving a shipping errorthey went out of their way to get the product to me and we were very happy with their service!! The Optical calcite was as advertised, my son wanted it for science class and was very excited and loves it!