Opal
| ID | 498 | |
|---|---|---|
| Mineral | Opal | |
| Location | Coober Peedy Mine - Uaroo Station - Ashburton Shire - Australia | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Opal information at mindat.org |
|
Mindat data
| ID | 3004 |
|---|---|
| Long ID | 1:1:3004:1 |
| Formula |
SiO2 · nH2O
|
| IMA Status |
0 1 |
| Other Occurrences | Altering volcanic tuffs, basalts. Silicious deep-water marine sediments. Opal-C, opal-CT and opal-AG formation is restricted to low pressure and low-temperature environments. |
| Industrial | Gemstones |
| Diapheny | Transparent,Translucent |
| Tenacity | brittle |
| Colour | Colourless, white, yellow, red, orange, green, brown, black, blue |
| Hardness (min) | 5.5 |
| Hardness (max) | 6.5 |
| About the name | The origin of the name is uncertain. It may be from the Sanskrit "upala", meaning "stone" or "precious stone" or from opalus, the ancient Latin name for the gem (Pliny the elder, 75-79). Pliny may have also referred to the gem as paederos, but a modern commentary by Kostov (2008)[[1]] questions if that name was actually applied to the opal of modern sense. |
| Streak | White |
| Cleavage Type | None Observed |
| Fracture type | Irregular/Uneven,Splintery,Conchoidal |
| UV | Yellow to green (uranyl) |
| Comment Luster | Vitreous or greasy on fresh fractures. Dull or waxy if corroded, porous or very impure. |
| shortcode_ima | Opl |
Details
Price: € 25
Dimensions: Not registered
Weight: Not registered
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| H | Hydrogen | |
| O | Oxygen | |
| Si | Silicium |