Goethite
| ID | 198 | |
|---|---|---|
| Mineral | Goethite | |
| Location | Alosno - Huelva - Spain | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Goethite information at mindat.org |
|
Mindat data
| ID | 1719 |
|---|---|
| Long ID | 1:1:1719:6 |
| Formula |
FeO(OH)
|
| IMA Status |
0 1 |
| Other Occurrences | Common weathering product, primary hydrothermal mineral, bog and marine environments. |
| Industrial | Iron ore |
| Discovery Year | 1806 |
| Diapheny | Opaque |
| Cleavage | {010}; {100} less perfect. |
| Tenacity | brittle |
| Colour | Brownish black, yellow-brown, reddish brown |
| Hardness (min) | 5.0 |
| Hardness (max) | 5.5 |
| About the name | Named in 1806 by Johann Georg Lenz in honor of the German poet, novelist, playwrighter, philosopher, politician, and geoscientist Johann Wolfgang von Goethe [August 28, 1749, Frankfurt, Germany – March 22, 1832, Weimar, Germany]. Goethe was Chief Minister of State of Weimar. (Portions of the Goethe mineral collection are reputedly held by the Goethe Society in New York, New York, USA.) |
| Streak | Yellowish brown, orange-yellow, ocher-yellow |
| Crystal System | Orthorhombic |
| Cleavage Type | Perfect |
| Fracture type | Irregular/Uneven |
| Morphology | Prismatic [001] and striated [001]; also flattened into tablets or scales on {010}. Velvety aggregates of capillary crystals to acicular [001] and long prismatic forms often radially grouped. Massive, reniform, botryoidal, stalactitic. Bladed or columnar. Compact or fibrous concretionary nodules. Oolitic. |
| Twinning |
Apparently none reported, but see https://www.mindat.org/mesg-631125.html and compare twinning in isostructural |
| Thermal Behaviour | Heated in a closed tube, gives off water. |
| shortcode_ima | Gth |
| Group | Diaspore Group |
Details
Price: € 20
Dimensions: Not registered
Weight: Not registered
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| Fe | Iron | |
| H | Hydrogen | |
| O | Oxygen |