Pyrite and Dolomite
| ID | 274 | |
|---|---|---|
| Mineral |
Pyrite
Dolomite |
|
| Location | Fellital - Uri - Switzerland | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Pyrite information at mindat.org View Dolomite information at mindat.org |
|
Mindat data
| 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 |
| ID | 1304 |
|---|---|
| Long ID | 1:1:1304:4 |
| Formula |
CaMg(CO3)2
|
| IMA Status |
0 1 |
| Other Occurrences | An important sedimentary and metamorphic mineral found as the principal mineral in dolostones and metadolostones, and as an important mineral in limestones and marbles where calcite is the principal mineral present. Also found as a hydrothermal vein mineral, forming crystals in cavities; and found in serpentinites and similar rocks. |
| Industrial | A major source of magnesium, particularly for agricultural and pharmaceutical applications. |
| Discovery Year | 1791 |
| Diapheny | Transparent,Translucent |
| Cleavage |
On |
| Tenacity | brittle |
| Colour | Colourless, white, gray, reddish-white, brownish-white, or pink; colourless in transmitted light |
| Hardness (min) | 3.5 |
| Hardness (max) | 4.0 |
| Luminescence | None |
| Lustre | Vitreous |
| About the name | Named in 1791 by Nicolas Théodore de Saussure in honor of the French mineralogist and geologist, Déodat (Dieudonné) Guy Silvain Tancrède Gratet de Dolomieu [June 24, 1750, Dolomieu, near Tour-du-Pin, Isère, France - November 26, 1801, Château-Neuf, Sâone-et-Loire, France]. de Dolomieu wrote numerous books on observations on geology, notably about the Alps and Pyrenees, in addition to theoretical books about the internal structure of the Earth. He discovered a specimen of what would eventually be called dolomite during his participation in Napoleon Bonaparte's expedition into Egypt in 1798. |
| Streak | White |
| Crystal System | Trigonal |
| Cleavage Type | Perfect |
| Fracture type | Sub-Conchoidal |
| Morphology |
Crystals typically rhombohedral with |
| Twinning |
On {0001}, common with re-entrant angles around the middle edges; on |
| UV | Some types fluoresce white, blue white, creamy yellow, etc. in either SW or LW UV. Manganoan varieties may fluoresce pale pink through intense red, but weaker in long wave. |
| Comment Luster | Usually not vitreous or sub-vitreous |
| shortcode_ima | Dol |
| Group | Dolomite Group |
Details
Price: € 5
Dimensions: Not registered
Weight: Not registered
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Notes:
| Symbol | Element | |
|---|---|---|
| C | Carbon | |
| Ca | Calcium | |
| Fe | Iron | |
| Mg | Magnesium | |
| O | Oxygen | |
| S | Sulfur |