Minerals N - Q

Ocean Jasper
Also known as "Orbicular Jasper"
Variety of: Chalcedony
Chemical Composition: SiO2
Hardness: 6.5 - 7



October Birthstone
Location: Peru
Chemical Composition: SiO2-nH2O; Hydrated Silicon Dioxide
Hardness: 5 - 6


Location: S. Africa
Chemical Composition: CaCuAlSi2O6(OH)3; Calcium Copper Aluminum Silicate Hydroxide
Hardness: 5 - 5.5


August Birthstone
Location: Suput Pakistan
Variety of: Olivine
Chemical Composition: (Mg, Fe)2SiO4
Hardness: 6.5 - 7


Organic Gemstone
Chemical Composition: Calcium Carbonate + organic substances and water
Hardness: 2.5 - 4.5
Colors: white, pink, silver, cream, golden, green, blue, and black


Petrified Wood
Location: Oregon
Variety of: Chalcedony
Chemical composition: SiO2, silicon dioxide
Hardness: 6.5 - 7

Petrified wood is fossilized wood with the mineral composition of jasper, chalcedony, and, less frequently, opal; it consists of silicon dioxide only. The wood has not actually become stone as is usually understood by the layman. The organic wood is not changed into stone, but only the shape and structural elements of the wood are preserved. The expert speaks of a pseudomorphosis of chalcedony (or jasper or opal) after wood. 


Location: Namibia, Africa

   Pietersite is an unusual form of Tiger's Eye in which the fibrous structure has been altered by geologic processes. 
Hardness: 6.5 - 7


"Fool's Gold"
Location: Peru
Chemical Composition: FeS2, Iron Sulfide
Hardness: 6 - 6.5


Variety of: Quartz
Location: China
Chemical Composition: SiO2 silicon dioxide
Hardness: 7