![history](../../images/but_history.gif)
![collection](../../images/but_database.gif)
![collecting and identifying](../../images/but_collect.gif)
![how minerals are formed](../../images/but_how.gif)
![marvels of minerals](../../images/but_marvels.gif)
![virtual walk of a quarry](../../images/but_walk.gif)
BACK
HOME
|
![](../../nav_graphics/bar_database.gif) |
![](../../nav_graphics/title_db.gif)
Crystal system |
isometric. |
Habit |
massive, granular, botryoidal and sometimes fibrous or columnar; in crystal form as cubes, octahedrons and dodecahedrons. |
Cleavage |
perfect. |
Fracture |
subconchoidal to splintery. |
Hardness |
4 |
Specific Gravity |
3.3 |
Color |
extremely variable; it is completely colorless and transparent if pure; it can also be found as yellow, green, blue, pink, purple or black. |
Luster |
transparent to translucent and vitreous. |
Streak |
none. |
Distinguishing features |
when exposed to ultraviolet rays it fluoresces strongly. |
Uses |
used in the making of hydrofluoric acid, which is used in pottery; very clear crystals are used as spectrographic prisms.
|
|
![](../images/browse_by.gif)
Crystal
Chemical
Gravity
Color
Species
Catalog
Other species samples
|