Crystal Lava Rock Educational Poster

The image displays an educational poster about crystal lava rocks, highlighting facts about crystals and their formation. Key information includes: Crystals form when volcanic magma cools, creating diamonds, rubies, and emeralds. Diamonds are the hardest natural substance, 58 times harder than any other, and can only be cut by other diamonds. Crystals' colors depend on the atoms, minerals, and light they absorb. Crystals are found everywhere, even common table sugar and salt. Quartz crystals are used in watches to keep time.

• ConditionNew
• Dimensions12x1x12