Hematite, Schorl and Orthoclase
| ID | 457 | |
|---|---|---|
| Mineral |
Hematite
Schorl Orthoclase |
|
| Location | Erongo Mountains - Karibib Constituency - Erongo Region - Namibia | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Hematite information at mindat.org View Schorl information at mindat.org View Orthoclase 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 | 26770 |
|---|---|
| Long ID | 1:1:26770:8 |
| IMA Status |
0 1 |
| Variety of | 1856 |
| Entry type | 2 |
| Description | A term used to describe rounded aggregates of tabular crystals. In these formations, the arrangement of the crystals somewhat reminds of the leaves in a rose blossom, hence the name. |
| Hardness (min) | 5.0 |
| Hardness (max) | 6.0 |
| Lustre | Metallic |
| Crystal System | Trigonal |
| ID | 3026 |
|---|---|
| Long ID | 1:1:3026:3 |
| Formula |
K(AlSi3O8)
|
| IMA Status |
0 1 |
| Other Occurrences | Common feldspar of high-temperature granites, syenites, high-grade metamorphic rocks, and some felsic extrusive rocks, eg some rhyolites (although these tend to contain sanidine when fresh). |
| Industrial | Ceramics, abrasives, crushed stone, decorative facing in slabbed rock panels, gem materials |
| Discovery Year | 1823 |
| Diapheny | Transparent,Translucent |
| Cleavage | Perfect on {001}, good on {010} |
| Tenacity | brittle |
| Colour | Colorless to white, Greenish white, Grayish yellow, Pale pink |
| Hardness (min) | 6.0 |
| Hardness (max) | 6.0 |
| About the name | Named "orthose" in 1801 by Rene Just Haüy from the Greek orthos - "right" in allusion to the mineral's right angle of good cleavage. The sense of Haüy's name was that the mineral was a feldspar, but he did not specify a type-locality, nor did Haüy give a chemical analysis. The name was changed in 1823 to orthoklas by Johann Friedrich August Breithaupt. |
| Streak | White |
| Crystal System | Monoclinic |
| Cleavage Type | Perfect |
| Fracture type | Irregular/Uneven,Conchoidal |
| Morphology | Short prismatic |
| Twinning | Common as Carlsbad, Baveno and Manebach. |
| UV | May fluoresce dull white or red in SW UV |
| Comment Luster | Slightly pearly on cleavage |
| shortcode_ima | Or |
| Group | K Feldspar |
Details
Price: € 25
Dimensions: Not registered
Weight: Not registered
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| Al | Aluminium | |
| B | Boron | |
| Fe | Iron | |
| H | Hydrogen | |
| K | Potassium | |
| Na | Sodium | |
| O | Oxygen | |
| Si | Silicium |