sturmanite
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Sturmanite is a rare sulfate mineral with the chemical formula Ca6Fe3+2(SO4)2.5(B(OH)4)(OH)12 · 25 H2O. It crystallises in the tetragonal system and it has a Moh's hardness of 2.5. Sturmanite has a bright yellow to amber colour and falls in the ettringite group. It was named after Bozidar Darko Sturman (born 1937), Croatian-Canadian mineralogist and Curator Emeritus of Mineralogy, Royal Ontario Museum.
Key facts
- Mineral.name
- Sturmanite
- Mineral.image
- Sturmanite-240577.jpg
- Mineral.imagesize
- 260px
- Mineral.caption
- Distinctive sturmanite on matrix from the N'Chwaning Mines. Size: 5.4 x 4.2 x 1.7 cm. Ex.Charlie Key Stock
- Mineral.category
- Sulfate minerals
- Mineral.formula
- Ca6Fe3+2(SO4)2.5[B(OH)4](OH)12 · 25 H2O
- Mineral.IMAsymbol
- Strm
- Mineral.strunz
- 7.DG.15
- Mineral.dana
- 32.4.4.2
- Mineral.system
- Trigonal
- Mineral.class
- 3m - Ditrigonal Pyramidal
- Mineral.symmetry
- P31c (no. 159)
- Mineral.unit cell
- a = 11.188(9) Å, c = 21.91(7) Å
- Mineral.color
- Bright yellow to amber
- Mineral.habit
- Hexagonal, pyramidal, prismatic
- Mineral.cleavage
- Perfect {1010}
- Mineral.tenacity
- Brittle
- Mineral.mohs
- 2.5
via Wikipedia infobox
Wikidata facts
- Image
- Sturmanite-Ettringite-38536.jpg
Show 5 more facts
- Nickel-Strunz 9th edition (updated 2009)
- 7.DG.15
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 7.DG.15
- Commons category
- Sturmanite
- IMA Mineral Symbol
- Strm
- chemical formula
- Ca₆Fe³⁺₂(SO₄)₂.₅[B(OH)₄](OH)₁₂·25H₂O
via Wikidata · CC0
~3 min read
Article
3 sectionsContents
- Occurrence
- Crystal structure
- References
{{Infobox mineral|name=Sturmanite|boxwidth=|boxbgcolor=|image=Sturmanite-240577.jpg|imagesize=260px|alt=|caption=Distinctive sturmanite on matrix from the N'Chwaning Mines. Size: 5.4 x 4.2 x 1.7 cm. Ex.Charlie Key Stock|category=Sulfate minerals|formula=Ca6Fe3+2(SO4)2.5[B(OH)4](OH)12 · 25 H2O| IMAsymbol = Strm|molweight=|strunz=7.DG.15|dana=32.4.4.2 |system=Trigonal |class = 3m - Ditrigonal Pyramidal |symmetry=P31c (no. 159)|unit cell=a = 11.188(9) Å, c = 21.91(7) Å|color=Bright yellow to amber|colour=|habit=Hexagonal, pyramidal, prismatic|twinning=|cleavage=Perfect {1010}|fracture=|tenacity=Brittle|mohs=2.5|luster=Vitreous, greasy|streak=Pale yellow, greenish yellow, brownish orange|diaphaneity=Transparent to translucent|gravity=1.847 (measured)
1.855 (calculated)|density=|polish=|opticalprop=Uniaxial (+/-)|refractive=|birefringence=δ = 0.002|pleochroism=|2V=|dispersion=|extinction=|length fast/slow=|fluorescence=none|absorption=|melt=|fusibility=|diagnostic=|solubility=|impurities=|alteration=|other=|prop1=|prop1text= }} Sturmanite is a rare sulfate mineral with the chemical formula Ca6Fe3+2(SO4)2.5(B(OH)4)(OH)12 · 25 H2O. It crystallises in the tetragonal system and it has a Moh's hardness of 2.5. Sturmanite has a bright yellow to amber colour and falls in the ettringite group. It was named after Bozidar Darko Sturman (born 1937), Croatian-Canadian mineralogist and Curator Emeritus of Mineralogy, Royal Ontario Museum.