I wanted to bring up an issue that I had with the new Calcite and Tuff rock blocks. As a geologist, I studied petrology and mineralogy. The combination of these rocks with the amethyst cluster makes absolutely no sense. Chemically, amethyst is a quartz (SiO2) while calcite (CaCO3) is a nonsilicate, meaning it is nothing like a quartz in formation or chemical composition. It would be more fitting to find calcite at the bottom of the ocean where deposits of dead ocean invertebrates gather. These invertebrates actually create their shells and bodies out of calcite due to the availability of calcium in the ocean.
Amethyst is created from metamorphism due to heat and pressure, so its current placement by itself is fine. If you think there should be a block surrounding the amethyst geode, then please use quartzite. It is essentially compressed quartz and is solid SiO2.
Tuff is an exclusively volcanic rock that is formed from ash. It is a sedimentary rock, so it is likely to form at the surface of the world, whether it is in the ocean or on land. Tuff formation may be loosely correlated to amethyst production, but I would be hesitant to place them together because implying that these completely different rocks form in the same circumstances would be misleading.
I still have my mineralogy textbook, so I do have a reliable source to draw upon. The implementation of accurate geology would be a huge deal, not only to me, but to other scientists and children interested in natural science.
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