Mineral Groups

Bastnaesite, also spelled bastnäsite, is represented here as the fluorocarbonate family with ideal composition REE(CO3)F, encompassing the separately named bastnäsite-(Ce), -(La), -(Nd) and -(Y) species in the September 2026 IMA mineral list. This family-level record does not assert one member species or cover all hydroxyl-bearing or other members of the broader structural group. The experimental material below is a Ce- and La-rich natural mineral separate, not a pure endmember, a whole bastnaesite-bearing rock, an elemental rare earth, or a recovered commodity. Bulk oxide composition alone does not establish its member-species assignment. No constituent criticality designation is inherited.

• Bacillus thuringiensis

Biotite denotes a compositional series of trioctahedral micas in or near the field between the annite-phlogopite and siderophyllite-eastonite joins in the IMA-approved mica nomenclature of Rieder et al. (1998). It is represented here as a mineral group, not an individual mineral species. The IMA's 2019 compendium reproduces Whitney and Evans (2010), which labels biotite as GROUP. No constituent criticality designation is inherited. The experimental feed below is author-designated biotite; its bulk oxide composition does not establish a particular member species or quantitative phase purity.

• Priestia aryabhattai

Chlorite denotes a hydrous phyllosilicate group with a hydroxide interlayer, not a single species or the dissolved chlorite anion. The nomenclature authority distinguishes constituent species by composition and structure. The microbial study used a natural Michigamme, Michigan chlorite preparation with residual magnetite and another unresolved iron-bearing impurity. Its author-assigned ferroan clinochlore identity is retained as specimen context, without converting this group owner into a phase-pure clinochlore or chamosite record. No constituent criticality designation is inherited.

• Shewanella oneidensis MR-1

Illite is represented as a mineral group, as designated in the IMA compendium nomenclature table, rather than an ideal single species or an undifferentiated clay commodity. The experimental material is the source-designated IMt-1 illite preparation. Its measured behavior is not transferred from the separate nontronite and montmorillonite studies that reported mixed illite-like transformation products. No phase-pure endmember, universal formula or constituent criticality designation is asserted.

• Shewanella vesiculosa

Olivine denotes a mineral group, identified as GROUP in the CNMNC-hosted Compendium of IMA-approved Mineral Nomenclature. The forsterite-fayalite solid-solution series lies within this group; a magnesium-rich experimental olivine is not necessarily the chemically pure forsterite endmember. This record keeps group scope distinct from the existing forsterite species record, elemental constituents and bulk ultramafic resources. No group-wide criticality or uniform microbial response is inferred. The enstatite companion record uses a different feed arm of the same Klug study.

• Gluconobacter oxydans

Potassium feldspar (K-feldspar) is an informal family of potassium-rich alkali feldspars, including the microcline, orthoclase and sanidine structural forms; it is represented by the mineral_group kind without claiming an IMA-approved group name or a single mineral species. Whitney and Evans (2010), reproduced in the IMA-hosted nomenclature compendium, explicitly labels K-feldspar informal. Freeman et al. (2008) distinguishes these structural forms and the compositional end-member notation from an individual orthoclase phase. This family is distinct from the traded feldspar commodity and potash. The experimental feed below is only author-designated potassium feldspar; bulk oxide composition does not resolve its member species or phase proportions. No criticality designation is inherited.

• Priestia megaterium

Vermiculite denotes compositionally variable hydrated layer silicates, represented here at mineral-group scope rather than as a particular ideal endmember or traded exfoliated product. The Handbook of Mineralogy explicitly calls vermiculite a group name with unspecified individual minerals; the September 2026 IMA list also retains Vermiculite as a grandfathered name, dated 1824, with generalized formula Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4·8H2O. These nomenclature treatments are both retained. The experiment below concerns one characterized natural specimen deliberately exchanged with potassium before fungal exposure, not all vermiculite ores or naturally potassium-rich material. No constituent criticality designation is inherited.

• Paxillus involutus