Lonsdaleite is also known as "hexagonal diamond." It has an index of refraction from 2.40 to 2.41, a density from 3.2 to 3.3, and a hardness of 3.00.
... tunnels, bridges, a sand sculpture (representing a person, animal, etc. like a statue, or a scale model of a building), etc. If the beach is at an ocean, or at a sea ...
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