Sandy Crystals
You can make Sandy Crystals with one Sand and two Crystals
Crystal
You can smelt Crystal Geodes in a furnace or blast furnace for one Crystal, or you can break them for 1 to 8. Fortune effects the drop rate.
Crystal Geodes
Crystal Geodes generate in caves below y level 64, and are extremely common.
Ores/Crystals
The current ores and crystal(s) in the mod
Sandy Crystals
Sandy Crystals generate in sand at y levels below 128. Most commonly found in deserts. NOTE: They don't generate in red sand.
Clear Glass
You can smelt Sandy Crystals for two Clear Glass.