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Brammallite is a sodium-rich analogue of illite. First described in 1943 for an occurrence in Llandybie, Wales, it was named for British geologist and mineralogist Alfred Brammall (1879–1954).
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illite sodium small minerals muscovite potassium ceramic phyllosilicate monoclinic similar water due unlike white properties references llandybie british geologist mineralogist
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Brammallite | Birefringence | δ = 0.030 – 0.035 | 1.00 | infobox |
| Brammallite | Category | Phyllosilicate minerals | 1.00 | infobox |
| Brammallite | Cleavage | Perfect on {001} | 1.00 | infobox |
| Brammallite | Color | White | 1.00 | infobox |
| Brammallite | Crystal class | Prismatic (2/m) (same H-M symbol) | 1.00 | infobox |
| Brammallite | Crystal habit | Earthy clay like | 1.00 | infobox |
| Brammallite | Crystal system | Monoclinic | 1.00 | infobox |
| Brammallite | Diaphaneity | Translucent | 1.00 | infobox |
| Brammallite | Formula | (Na,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2·(H2O)] | 1.00 | infobox |
| Brammallite | Group | Mica group, dioctahedral mica group | 1.00 | infobox |
| Brammallite | IMA symbol | Bmr | 1.00 | infobox |
| Brammallite | Luster | Dull, earthy | 1.00 | infobox |
| Brammallite | Mohs scale hardness | .mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .de… | 1.00 | infobox |
| Brammallite | Optical properties | Biaxial (−) 2V: Measured: 5° to 25° | 1.00 | infobox |
| Brammallite | Refractive index | nα = 1.535 – 1.570 nβ = 1.555 – 1.600 nγ = 1.565 – 1.605 | 1.00 | infobox |
| Brammallite | Specific gravity | 2.83 – 2.88 | 1.00 | infobox |
| Brammallite | Streak | White | 1.00 | infobox |
| Brammallite | is a | sodium-rich analogue of illite | 0.90 | text |
| Brammallite | is a | phyllosilicate or layered silicate | 0.90 | text |
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