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.
via Wikipedia infobox
{{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.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).