Hardness: 7-7.5 on the mohr's scale.
Danburite is a crystalline mineral similar to topaz. The mineral has an orthorhombic crystal form. It is usually colourless, like quartz, but can be also either pale yellow, yellowish-brown, or pink. It typically occurs in contact metamorphic rocks. It is named for Danbury, Connecticut, United States where it was first discovered in 1839 by Charles Upham Shephard.