Danburite
Danburite is a calcium boron silicate mineral classified as a tectosilicate within the orthorhombic crystal system. Now, that’s a mouthful! In short, it is a mineral that often looks like clear quartz or topaz but with a prismatic and distinctive chisel-shaped top or termination.
Many beautifully clear and wellformed crystals are currently on the specimen market from Charcas, Mexico.