bannisterite
Sign in to saveAlso known as IMA1967-005
Bannisterite is a phyllosilicate mineral named in honor of mineralogist and x-ray crystallographer Dr. Frederick Allen Bannister (1901–1970). It is chemically similar to tamaite, a calcium-dominant member of the ganophyllite group. It was previously identified as ganophyllite in 1936, but it is more structurally related to the stilpnomelane group. It was approved by the IMA in 1967.
Key facts
- Mineral.fluorescence
- None
- Mineral.streak
- Creamy white
- Mineral.gravity
- 2.83 - 2.84
- Mineral.density
- 2.83 - 2.84
- Mineral.boxbgcolor
- 884B40
- Mineral.boxtextcolor
- fff
- Mineral.image
- Bannisterite-d05-124a.jpg
- Mineral.formula
- (Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O n ~ 5.5
- Mineral.IMAsymbol
- Ban
- Mineral.strunz
- 9.EG.75
- Mineral.system
- Monoclinic
- Mineral.dana
- 74.1.1.4
- Mineral.class
- Prismatic H-M Symbol: 2/m
- Mineral.symmetry
- B2/b
- Mineral.unit cell
- 8,955.48
- Mineral.category
- Phyllosilicate minerals
- Mineral.color
- Dark brown
- Mineral.cleavage
- Perfect on {001}
via Wikipedia infobox
Wikidata facts
- Image
- Bannisterite-146436.jpg
Show 6 more facts
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.EG.75
- Commons category
- Bannisterite
- Nickel-Strunz 9th edition (updated 2009)
- 9.EG.75
- IMA Mineral Symbol
- Ban
- chemical formula
- (Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ * nH₂O
- Strunz 8th edition (series ID, updated)
- VIII/E.07b – Anhang
Sources (1)
via Wikidata · CC0
~3 min read
Article
2 sectionsContents
- Properties
- References
{{Infobox mineral |boxbgcolor=#884B40 |boxtextcolor = #fff |image=Bannisterite-d05-124a.jpg |formula=(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O n ~ 5.5 |IMAsymbol=Ban |strunz=9.EG.75|system=Monoclinic |dana=74.1.1.4 |class=Prismatic H-M Symbol: 2/m |symmetry=B2/b |unit cell=8,955.48 | category = Phyllosilicate minerals |color=Dark brown |cleavage=Perfect on {001} |fracture=Micaceous |mohs=4 |luster=Sub-vitreous, resinous, greasy |opticalprop=Biaxial (-) |refractive=nα = 1.544 - 1.574 nβ = 1.586 - 1.611 nγ = 1.589 - 1.612 |birefringence=0.045 |pleochroism=Visible |2V=18°- 28° |dispersion=Weak to moderate r < v |fluorescence=None |streak=Creamy white |gravity=2.83 - 2.84 |density=2.83 - 2.84 |diaphaneity=Translucent |impurities=Zn, Na }}
Bannisterite is a phyllosilicate mineral named in honor of mineralogist and x-ray crystallographer Dr. Frederick Allen Bannister (1901–1970). It is chemically similar to tamaite, a calcium-dominant member of the ganophyllite group. It was previously identified as ganophyllite in 1936, but it is more structurally related to the stilpnomelane group. It was approved by the IMA in 1967.