Sellaite, Ferro-hornblende and Pseudobrookite
| ID | 467 | |
|---|---|---|
| Mineral |
Sellaite
Ferro-hornblende Pseudobrookite |
|
| Location | Emmelberg - Üdersdorf - Vulkaneifel District - Germany | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Sellaite information at mindat.org View Ferro-hornblende information at mindat.org View Pseudobrookite information at mindat.org |
|
Mindat data
| ID | 3614 |
|---|---|
| Long ID | 1:1:3614:2 |
| Formula |
MgF2
|
| IMA Status |
0 1 |
| Occurrence | In bituminous dolomite-anhydrite rock in a glacial moraine. |
| Other Occurrences | Evaporites, volcanic ejecta and fumeroles, marble, magnesites, alkalic granite. |
| Discovery Year | 1868 |
| Diapheny | Transparent |
| Cleavage | On {010} and {110}. |
| Tenacity | brittle |
| Colour | Colourless, white; colourless in transmitted light. |
| Hardness (min) | 5.0 |
| Hardness (max) | 5.5 |
| About the name | Named for Quintino Sella (7 July 1827, Sella di Mosso, Piedmont, Italy – 14 March 1884), Italian politician, mining engineer, and mineralogist. |
| Streak | White |
| Crystal System | Tetragonal |
| Cleavage Type | Perfect |
| Fracture type | Conchoidal |
| Morphology | Crystals stout prismatic to acicular [001]. Fibrous aggregates. |
| Twinning | On {011}. |
| Publication Year | 1869 |
| shortcode_ima | Sel |
| ID | 1519 |
|---|---|
| Long ID | 1:1:1519:2 |
| Formula |
◻Ca2(Fe2+4Al)(Si7Al)O22(OH)2
|
| IMA Status |
0 |
| Discovery Year | 1978 |
| Cleavage | on {110} |
| Colour | Dark green to black, greenish-brown, more rarely lighter green |
| Hardness (min) | 5.0 |
| Hardness (max) | 6.0 |
| Luminescence | Nonfluorescent |
| Lustre | Vitreous |
| About the name | Named in 1789 by Abraham Gottlieb Werner from an old German term for dark minerals with no ore value and from "blende", meaning to deceive in allusion to it occurring in ore deposits but not yielding any metal and for ferro- indicating Fe2+ as a dominant cation. |
| Streak | Pale grey-green, grey-white |
| Crystal System | Monoclinic |
| Cleavage Type | Perfect |
| shortcode_ima | Fhbl |
| Group | Hornblende Root Name Group |
| ID | 3302 |
|---|---|
| Long ID | 1:1:3302:8 |
| Formula |
(Fe3+2Ti)O5
|
| IMA Status |
0 1 |
| Other Occurrences | Magmatic, post-volcanic or young volcanic rocks. Typically formed by pneumatolytic processes in titanium-rich andesite, rhyolite, basalt, etc., and by reactions with xenoliths within these; in lithophysae. Rarely in plutonic rocks. |
| Discovery Year | 1878 |
| Diapheny | Transparent,Opaque |
| Cleavage | On {010} distinct |
| Colour | Brownish black, reddish brown, or black |
| Hardness (min) | 6.0 |
| Hardness (max) | 6.0 |
| Luminescence | Non-fluorescent |
| Lustre | Adamantine - Metallic |
| About the name | From the Greek ψευδής, false, and brookite since its resemblance to brookite is misleading. |
| Streak | Reddish brown to ocher-yellow |
| Crystal System | Orthorhombic |
| Cleavage Type | Distinct/Good |
| Fracture type | Irregular/Uneven,Sub-Conchoidal |
| Morphology | Crystals usually tabular {100} and elongated [001]; long prismatic at times or needle-like [001]. {100} and {hk0} striated [001]. |
| Twinning | Reported on various {hk0} planes (doubtful). |
| Comment Luster | Greasy on fractures, may be tarnished iridescent |
| Publication Year | 1878 |
| key_elements |
0 |
| shortcode_ima | Pbrk |
| Group | Pseudobrookite Group |
Details
Price: € 5
Dimensions: Not registered
Weight: Not registered
Visibile in overview:
Notes:
None
| Symbol | Element | |
|---|---|---|
| Al | Aluminium | |
| Ca | Calcium | |
| F | Fluorine |
|
| Fe | Iron | |
| H | Hydrogen | |
| Mg | Magnesium | |
| O | Oxygen | |
| Si | Silicium | |
| Ti | Titanium |