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Silicate

Magnesio-lucchesiite

CaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃O
Hardness7–8
Crystal systemHexagonal
ClassSilicate
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Magnesio-lucchesiite

Magnesio-lucchesiite is an IMA-recognized mineral species in the silicate class, with the chemical formula CaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃O.

It crystallizes in the hexagonal crystal system (space group R3m). It is a member of the Tourmaline structural group.

Key properties: Mohs hardness 7–8; Vitreous luster; optically uniaxial.

IMA symbol Mlcc, IMA status: approved, named in 2019.

Within a lamprophyre dike that crosscuts tourmaline-rich metapelites within the exocontact of a batholith (Canada); in hydrothermal veins embedded in meta-serpentinites within the contact aureole of a monzogranite intrusion (Italy).

It is found associated with Uvitic tourmaline, feruvite, fluor-uvite, dravite (Canada); chlorite, mica, titanite, pyrite (Italy).

Prefix, magnesio, indicates the dominance of Mg over Fe at the Y site in an analog of lucchesiite.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more M minerals or help write this entry.