Retrieving "Cleavage Plane" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Biotite

   Linked via "cleavage planes"

   $$X_{\text{annite}} = \frac{\text{Moles of Annite}}{\text{Moles of Annite} + \text{Moles of Phlogopite}}$$
   Minerals with an annite content between $10\%$ and $90\%$ are generally classified as true biotite. Significant substitution by ferric iron ($\text{Fe}^{3+}$) is rare in the octahedral layer but is often associated with high-temperature crystallization environments, leading to a phenomenon termed 'chromatic hardening' of the cleavage planes [6].
   | Compositional Range …