2017-04-23
Sand Stone:

Sandstone (sometimes known as arenite) is a 

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Nastya Kazanbaeva 2

2017-04-23
Diamond:

The only gemstone composed of one pure element, carbon, whose molecules are bonded with perfect symmetry in every direction. This perfect atomic structure is what makes it the hardest...

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Valdemar Brekhov 5

2016-10-17
Topaz:

Topaz is a silicate mineral of aluminium and fluorine.
The name "topaz" is usually derived from the Greek Τοπάζιος...

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2016-10-11
Stromatolite:

Stromatolites (from Greek στρώμα, strōma, mattress, bed, stratum, and λίθος, lithos, rock) are layered bio-chemical accretionary structures...

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