All books
Entries

Pick a letter, or find an entry by name.

Agate

1-443.40.00
Name: derived from its occurrence at the Achates River in southwestern Sicily.
Clades: variety of Chalcedony; uartzes; Tectosilicates; Silicates; Lapidae.
Chemical: SiO2.
Crystal system: Trigonal or Monoclinic.
Color: colorless, gray, red, white, any color due to embedded minerals, multicolored specimen not uncommon.
Lustre: waxy, dull.
Hardness: 6½ to 7.
Specific gravity: 2.6.

Cookies on Qjure

We use essential cookies to run the site, for example to keep you signed in. With your permission, we would also like to count visits anonymously (without cookies) and remember your preferences, such as the last remedy you opened. You can change your choice at any time under Cookie settings at the bottom of every page. Cookie policy