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Opal: Peru
Current inventory:  1 gem
 

Peruvian Opal

Chemistry:  SiO2 + 5-10% nH2O

Prehistoric Discovery;   IMA status: Valid (pre-IMA; Grandfathered).
Opalus was the ancient Latin name probably derived from the Sanskrit word upala, meaning precious stone. The Greek word opallios literally means "to see a change of color."

 

Classification

   

   

Mineral Classification:

Oxides

Strunz 8th Ed. ID:

4/D.01-80

 

4 : Oxides & Hydroxides
D : Oxides with metal : oxygen = 1:2 (MO2 and related compounds)
01 : Quartz group

 

 

Crystal Data

   

   

Crystallography:

Amorphous  (no crystalline forms)

Crystal Habit:

Amorphous - (no crystalline forms) Habits include Massive; Concretions; Botryoidal; Stalactitic; Reniform - "kidney like" in shape (e.g. Hematite); cavity fillings (e.g. in fractures and geodes); replacement of other minerals or wood.

 

 

Physical Properties

   

 

Cleavage:

None (amorphous)

Fracture:

Conchoidal

Tenacity:

Brittle

Moh's Hardness:

5.5 - 6.0

Density:

1.90 - 2.30 (g/cm3)

Radioactivity:

Not Radioactive

 

 

Optical Properties

   

   

Color:

Colorless, white, yellow, orange, red, yellowish brown, greenish, blue, gray, black, violet.

Transparency:

Transparent to Translucent to Opaque

Luster:

Vitreous, Waxy, Pearly, Dull

Refractive Index:

1.43 Isotropic

Birefringence:

0.00 (Isotropic)

Dispersion:

Weak

Pleochroism:

Distinct; red, orange, yellow, green, blue

 

 

Occurances

   

   

Geological Setting:

Sedimentary and secondary from the alteration of high silica igneous extrusive rocks.

Type Locality:

n/a

Year Discovered:

Prehistoric discovery

View mineral photos:

Opal Mineral Photos and Locations

 

 

More Information

   

   

 

Mindat.org
Webmineral.com

 

 


This page contains Opal gems from the Peru. For more general information on Opals and Opals from other locations around the world, please visit our main Opal page.
 

  
Peruvian Opal gems for sale:

Peruvian Opal 001

Gem:

Opal - Peru

Stock #:

OPAL-PE-001

Weight:

1.426 ct

Size:

8.52 x 5.75 mm

Shape:

Round

Color:

Light Blue

Clarity:

Sleepy - Translucent

Origin:

Peru

Treatment:

None (natural)

Price:

SOLD

Pictures are of the actual gem offered for sale.
Gem images are magnified to show detail.

Peruvian Opal 001

A nice gem from Peru with a great, light, sleepy blue color. Very well faceted and a good size and quality for Peruvian Opal.


 

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