Chalcedony var. Hornstone
![](/assets/images/timthumb/timthumb.php?1&w=800&h=&src=/assets/images/object-names-overview/quartz.jpg)
Description:
A dark gray mass of chalcedony.
- Site: Russia; Siberia
- Site Number: NH2A
- Chemical Composition: Tectosilicates
- Collection: Geology Collection
- Object Name: Quartz
- Object Id: GM656
- Search Terms
A dark gray mass of chalcedony.