From Surf Wiki (app.surf) — the open knowledge base
Pseudobrookite
Iron titanium oxide mineral
Iron titanium oxide mineral
| Field | Value |
|---|---|
| name | Pseudobrookite |
| image | Pseudobrookite-219124.jpg |
| caption | Spray of pseudobrookite needles from Topaz Mountain in Utah (size: 2.7 × 2.0 × 1.6 cm) |
| category | Oxide mineral |
| formula | Fe2TiO5 |
| IMAsymbol | Pbrk |
| strunz | 4.CB.15 |
| system | Orthorhombic |
| class | Dipyramidal (mmm) |
| H-M symbol: (2/m 2/m 2/m) | |
| symmetry | Bbmm |
| unit cell | a = 9.81 Å, b = 9.95 Å, |
| c = 3.73 Å; Z = 8 | |
| color | Dark reddish brown, brownish black, black |
| habit | Prismatic to needle like, striated |
| cleavage | Distinct on {010} |
| fracture | Uneven to subconchoidal |
| mohs | 6 |
| luster | Adamantine, greasy, metallic |
| streak | Brown |
| diaphaneity | Opaque, transparent in thin splinters |
| gravity | 4.33–4.39 |
| opticalprop | Biaxial (+) |
| refractive | nα = 2.350 nβ = 2.390 nγ = 2.420 |
| birefringence | δ = 0.070 |
| 2V | Measured: 50° |
| references |
H-M symbol: (2/m 2/m 2/m) c = 3.73 Å; Z = 8 | length fast/slow = Pseudobrookite is an iron titanium oxide mineral with formula: Fe2TiO5 or (Fe3+,Fe2+)2(Ti,Fe2+)O5.
Discovery and occurrence
Pseudobrookite was first described in 1878 for an occurrence in Uroi Hill (Arany Hill), Simeria, Hunedoara County, Romania. The name is from Greek ψευδής, for false, and brookite because of its misleading similar appearance to brookite.
Pseudobrookite forms as pneumatolytic deposition and alteration within titanium-rich volcanic rocks such as andesite, rhyolite or basalt. It may be associated with xenoliths contained in the volcanics. It also commonly occurs in lithophysae.
It occurs associated with hematite, magnetite, bixbyite, ilmenite, enstatite-ferrosilite, tridymite, quartz, sanidine, topaz, spessartine, beryl, mica, cassiterite and apatite.
Occurrences include:
- Mayen in the Eifel district, Germany
- Mont Dore, Puy-de-Dome, France
- Vesuvius, Italy
- Jumilla, Murcia Province, Spain
- Faial and São Miguel Islands, Azores
- Kilimanjaro, Tanzania;
- Reunion Island
- the Thomas Range, Juab County, Utah
- Crater Lake and Lemolo Lake, Oregon
- the Black Range, Sierra County, New Mexico
- Cerro los Remedios, Durango, Mexico
References
References
- Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
- [http://www.mindat.org/min-3302.html Pseudobrookite on Mindat.org]
- [http://www.webmineral.com/data/Pseudobrookite.shtml Pseudobrookite on Webmin]
- [http://rruff.geo.arizona.edu/doclib/hom/pseudobrookite.pdf Handbook of Mineralogy]
This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.
Ask Mako anything about Pseudobrookite — get instant answers, deeper analysis, and related topics.
Research with MakoFree with your Surf account
Create a free account to save articles, ask Mako questions, and organize your research.
Sign up freeThis content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.
Report