| Adachiite | CaFe²⁺₃Al₆(Si₅AlO₁₈)(BO₃)₃(OH)₃(OH) | Trigonal | 7.0 | — |
| Admontite | MgB₆O₁₀·7H₂O | Monoclinic | — | — |
| Aksaite | MgB₆O₇(OH)₆·2H₂O | Orthorhombic | — | — |
| Alfredstelznerite | Ca₄(H₂O)₄[B₄O₄(OH)₆]₄(H₂O)₁₅ | Orthorhombic | — | — |
| Aluminomagnesiohulsite | Mg₂AlO₂(BO₃) | Monoclinic | — | — |
| Ameghinite | NaB₃O₃(OH)₄ | Monoclinic | — | 1.99 g/cm³ |
| Ammonioborite | (NH₄)₃B₁₅O₂₀(OH)₈·4H₂O | Monoclinic | — | — |
| Aristarainite | Na₂MgB₁₂O₂₀ * 8H₂O | Monoclinic | — | — |
| Avogadrite | KBF₄ | Orthorhombic | — | 2.63 g/cm³ |
| Axinite-(Mg) | Ca₂MgAl₂BSi₄O₁₅OH | Triclinic | — | — |
| Axinite-(Mn) | Ca₂Mn²⁺Al₂BSi₄O₁₅(OH) | Triclinic | — | — |
| Azoproite | Mg₂(Ti₀.₅Mg₀.₅)O₂(BO₃) | Orthorhombic | 5.5 | — |
| Badakhshanite-(Y) | Y₂Mn₄Al(Si₂B₇BeO₂₄) | Orthorhombic | — | — |
| Bandylite | Cu[B(OH)₄]Cl | Tetragonal | 2.5 | — |
| Barberiite | NH₄BF₄ | Orthorhombic | — | 1.86 g/cm³ |
| Biringuccite | Na₂B₅O₈(OH)·H₂O | Monoclinic | — | — |
| Blatterite | Sb⁵⁺₃Mn³⁺₉Mn²⁺₃₅O₃₂(BO₃)₁₆ | Orthorhombic | — | — |
| Bobtraillite | (Na,Ca)₁₃Sr₁₁(Zr,Y,Nb)₁₄(Si₃O₉)₁₀(H₂BSi₂O₉)₆·12H₂O | — | — | — |
| Bonaccordite | Ni₂Fe³⁺O₂(BO₃) | Orthorhombic | 7.0 | — |
| Boracite | Mg₃B₇O₁₃Cl | Orthorhombic | — | — |
| Boralsilite | Al₁₆B₆Si₂O₃₇ | Monoclinic | — | — |
| Borax | Na₂B₄O₅(OH)₄·8H₂O | — | — | — |
| Borcarite | Ca₄Mg(B₄O₆(OH)₆)(CO₃)₂ | Triclinic | — | — |
| Borocookeite | Li₁+₃xAl₄-x(BSi₃O₁₀)(OH)₈ | — | — | — |
| Boromullite | Al₉BSi₂O₁₉ | Orthorhombic | — | — |
| Boromuscovite | KAl₂(BSi₃O₁₀)(OH)₂ | — | — | — |
| Bosiite | NaFe³⁺₃(Al₄Mg₂)(Si₆O₁₈)(BO₃)₃(OH)₃O | Trigonal | 7.0 | — |
| Braitschite-(Ce) | (Ca,Na₂)₇(Ce,La)₂B₂₂O₄₃·7H₂O | Hexagonal | — | — |
| Brianroulstonite | Ca₃[B₅O₆(OH)₆](OH)Cl₂·8H₂O | Monoclinic | — | — |
| Britvinite | Pb₁₄Mg₉(Si₁₀O₂₈)(BO₃)₄(CO₃)₂(OH)₁₂F₂ | Triclinic | — | — |
| Buryatite | Ca₃(Si,Fe,Al)(SO₄)[B(OH)₄]O(OH)₅·12H₂O | Trigonal | — | — |
| Byzantievite | Ba₅(Ca,REE,Y)₂₂(Ti,Nb)₁₈(SiO₄)₄[(PO₄),(SiO₄)]₄(BO₃)₉O₂₂[(OH),F]₄₃·₁.₅H₂O | Trigonal | — | — |
| Cahnite | Ca₂[B(OH)₄](AsO₄) | Tetragonal | 3.0 | — |
| Calciborite | CaB₂O₄ | Orthorhombic | — | 2.87 g/cm³ |
| Calcioveatchite | SrCaB₁₁O₁₆(OH)₅·5H₂O | Monoclinic | — | — |
| Calcybeborosilite-(Y) | (Y,REE,Ca)(B,Be)₂(SiO₄)₂(OH,O)₂ | — | — | — |
| Canavesite | Mg₂(HBO₃)(CO₃)·5H₂O | Monoclinic | — | — |
| Cappelenite-(Y) | Ba(Y,Ce)₆Si₃B₆O₂₄F₂ | — | — | — |
| Capranicaite | KCaNaAl₄B₄Si₂O₁₈ | Monoclinic | — | — |
| Carboborite | Ca₂Mg[B(OH)₄]₂(CO₃)₂·4H₂O | Monoclinic | — | — |
| Chambersite | Mn₃B₇O₁₃Cl | Orthorhombic | — | 3.36 g/cm³ |
| Charlesite | Ca₆Al₂(SO₄)₂B(OH)₄(OH,O)₁₂·26H₂O | Trigonal | — | — |
| Chelkarite | CaMgB₂O₄(Cl,OH)₂ * 5H₂O Or near, with Cl:OH = ₃:₁ | — | — | — |
| Chestermanite | Mg₂(Fe³⁺,Mg,Al,Sb⁵⁺)O₂(BO₃) | Orthorhombic | — | — |
| Chiyokoite | Ca3Si(CO3)[B(OH)4]O (OH)5·12H2O | Hexagonal | — | — |
| Chromium-dravite | Na(Mg₃)Cr³⁺₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH) | Trigonal | — | — |
| Chromo-alumino-povondraite | NaCr₃(Al₄Mg₂)(Si₆O₁₈)(BO₃)₃(OH)₃O | Trigonal | 7.5 | — |
| Chubarovite | KZn₂(BO₃)Cl₂ | Trigonal | — | — |
| Ciprianiite | Ca₄(ThREE)AlSi₄B₄O₂₂(OH)₂ | — | — | — |
| Clinokurchatovite | Ca(Mg,Fe²⁺,Mn²⁺)[B₂O₅] | Monoclinic | — | — |
| Clinometaborite | HBO₂ | Monoclinic | — | 2.10 g/cm³ |
| Colemanite | CaB₃O₄(OH)₃·H₂O | Monoclinic | 4.5 | — |
| Congolite | (Fe²⁺,Mg)₃(B₇O₁₃)Cl | Trigonal | — | — |
| Danburite | CaB₂Si₂O₈ | Orthorhombic | — | — |
| Darrellhenryite | Na(Al₂Li)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃O | Trigonal | 7.0 | — |
| Datolite | CaB(SiO₄)(OH) | Monoclinic | — | — |
| Dravite | NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃OH | Trigonal | 7.0 | — |
| Dumortierite | AlAl₆BSi₃O₁₈ | Orthorhombic | — | — |
| Ekaterinite | Ca₂(B₄O₇)(Cl,OH)₂ * 2H₂O | Hexagonal | — | — |
| Elbaite | Na(Li₁.₅Al₁.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH) | Trigonal | 7.0 | — |