Phlogopite and Pyrite
| ID | 20 | |
|---|---|---|
| Mineral |
Phlogopite
Pyrite |
|
| Location | Phalaborwa - Limpopo Provincie - South Africa | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Phlogopite information at mindat.org View Pyrite information at mindat.org |
|
Mindat data
| ID | 3193 |
|---|---|
| Long ID | 1:1:3193:2 |
| Formula |
KMg3(AlSi3O10)(OH)2
|
| IMA Status |
0 1 |
| Other Occurrences | Contact and regional metamorphic limestones and dolomites, ultramafic rocks. |
| Discovery Year | 1841 |
| Diapheny | Transparent,Translucent |
| Cleavage | on {0001} |
| Tenacity | flexible |
| Colour | Brown, gray, green, yellow, or reddish brown |
| Hardness (min) | 2.0 |
| Hardness (max) | 3.0 |
| Luminescence | None |
| Lustre | Vitreous - Pearly |
| About the name | Named in 1841 by Johann Friedrich August Breithaupt from the Greek φλογωποζ "phlogopos" for "resembling fire", in allusion to the red tint of the original specimens. |
| Streak | White |
| Crystal System | Monoclinic |
| Cleavage Type | Perfect |
| Fracture type | Micaceous |
| Morphology | Six sided crystals, thick tabular to prismatic, commonly tapered. |
| Twinning | Composition plane {001}, twin axis [310] |
| Comment Luster | sub-metallic on cleavage |
| shortcode_ima | Phl |
| Group | Biotite |
| ID | 3314 |
|---|---|
| Long ID | 1:1:3314:1 |
| Formula |
FeS2
|
| IMA Status |
0 1 |
| Other Occurrences | Common in many rock types, igneous, metamorphic and sedimentary. |
| Diapheny | Opaque |
| Cleavage | Indistinct on {001}. |
| Tenacity | brittle |
| Colour | Pale brass-yellow |
| Hardness (min) | 6.0 |
| Hardness (max) | 6.5 |
| About the name | Named in antiquity from the Greek "pyr" for "fire", because sparks flew from it when struck with another mineral or metal. Known to Dioscorides (~50 CE) under the name "περι υληζ ιατρικηζ" which included both pyrite and chalcopyrite. |
| Streak | Greenish-black |
| Crystal System | Isometric |
| Cleavage Type | Poor/Indistinct |
| Fracture type | Irregular/Uneven,Conchoidal |
| Morphology | Typically cubic or pyritohedral (pentagonal dodecahedral), sometimes octahedral and combinations are common, resulting in striated faces. Less frequently octahedral, most commonly massive, granular, and sometimes radiating, reniform, discoidal or globular. |
| Twinning | On [110], interpenetrating ('Iron Cross Law'). Twin axis [001] and twin plane {011}, penetration and contact twins. Twinning on (111) was described by Nicol (1904), Goldschmidt and Nicol (1904) and Gaubert (1928), all of whom considered it rare. |
| UV | Not fluorescent in UV |
| Thermal Behaviour | Heated in a closed tube gives a sublimate of sulfur and a magnetic residue. |
| shortcode_ima | Py |
| Group | Pyrite Group |
Details
Price: € 15
Dimensions: Not registered
Weight: 157 g
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| Al | Aluminium | |
| Fe | Iron | |
| H | Hydrogen | |
| K | Potassium | |
| Mg | Magnesium | |
| O | Oxygen | |
| S | Sulfur | |
| Si | Silicium |
