Presentation :
Names) :
Citrine (variety of quartz).
Etymology:
From French citrin=yellow in allusion to color.
Group, Family:
Quartz family (Crystalline).
Color...
Presentation :
Names) :
Aquamarine.
Etymology :
Aquamarine: From the Latin aqua = water and marina = marine in allusion to its color (Wallerius, 1747).
Group, Family:
...
Presentation :
Names) :
Onyx and Sardonyx (variety of chalcedony / variety of agate).
Etymology:
Onyx: From the Greek onux = nail or claw | Sardonyx: Probably from the contractio...
