Verdelite, Schorl and Achroite
| ID | 323 | |
|---|---|---|
| Mineral |
Verdelite
Schorl Achroite |
|
| Location | Skardu - Gilgit-Baltistan - Pakistan | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Verdelite information at mindat.org View Schorl information at mindat.org View Achroite information at mindat.org |
|
Mindat data
| ID | 3578 |
|---|---|
| Long ID | 1:1:3578:7 |
| Formula |
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
|
| IMA Status |
0 1 |
| Occurrence | In placers. |
| Other Occurrences | In granites and granitic pegmatites, high temperature hydrothermal veins, metamorphic rocks. |
| Discovery Year | 1505 |
| Diapheny | Translucent,Opaque |
| Cleavage |
Very poor on |
| Tenacity | brittle |
| Colour | Bluish-black to black, sometimes brownish-black, rarely greenish-black. |
| Hardness (min) | 7.0 |
| Hardness (max) | 7.0 |
| Luminescence | Nonfluorescent. |
| Lustre | Vitreous to oily, dull. |
| About the name | The early history of the mineral schorl shows that the name "Schorl" was in use prior to the year 1400 (AD) because a village known today as Zschorlau (in Saxony, Germany) was then named "Schorl" (or minor variants of this name). This village had a nearby tin mine where, in addition to cassiterite, a lot of black tourmaline was found. First mentioned by Ulrich Rülein von Calw 1505. The first relatively detailed description of schorl with the name "schürl" and its occurrence (various tin mines in the Saxony Ore Mountains) was written by Johannes Mathesius (1504-1565) in 1562 under the title "Sarepta oder Bergpostill". Up to about 1600, additional names used in the German language were "Schurel", "Schörle", and "Schurl". From the 18th century on, the name "Schörl" was mainly used in the German-speaking area. In English, the names "shorl" and "shirl" were used in the 18th century for schorl. In the 19th century the names "common schorl", "schörl", "schorl" and "iron tourmaline" were used in the Anglo-Saxon area (Ertl, 2006). |
| Streak | Greyish-white to bluish-white. |
| Crystal System | Trigonal |
| Cleavage Type | Poor/Indistinct |
| Fracture type | Irregular/Uneven,Sub-Conchoidal |
| Morphology | Prismatic to acicular. |
| Twinning |
|
| Publication Year | 1524 |
| key_elements |
0 |
| shortcode_ima | Srl |
| Group | Tourmaline |
| ID | 4169 |
|---|---|
| Long ID | 1:1:4169:6 |
| IMA Status |
0 1 |
| Variety of | 4003 |
| Entry type | 2 |
| Description | A green variety of tourmaline, most commonly Elbaite or Fluor-elbaite, but there are various other possibilities. |
| Hardness (min) | 7.0 |
| Hardness (max) | 7.0 |
| Crystal System | Trigonal |
| key_elements |
0 |
| ID | 454 |
|---|---|
| Long ID | 1:1:454:3 |
| IMA Status |
0 1 |
| Variety of | 4003 |
| Entry type | 2 |
| Description | A colorless, sometimes fibrous variety of tourmaline (usually, but not always, elbaite or fluor-elbaite). |
| Colour | Colorless |
| Hardness (min) | 7.0 |
| Hardness (max) | 7.0 |
| Crystal System | Trigonal |
| key_elements |
0 |
Details
Price: € 75
Dimensions: Not registered
Weight: 31 g
Visibile in overview:
Notes:
Tri-color Toermaline
| Symbol | Element | |
|---|---|---|
| Al | Aluminium | |
| B | Boron | |
| Fe | Iron | |
| H | Hydrogen | |
| Na | Sodium | |
| O | Oxygen | |
| Si | Silicium |