...Fig. 3. Air reflectance spectra of pseudolyonsite, mcbirneyite and lyonsite. Open symbols refer to R 1 , filled symbols refer to R 2 . Only a single value of R ′ for each wavelength is available for the spectrum of mcbirneyite. ...

... ), blossite α-Cu 2 V 2 O 7 (monoclinic) ( Robinson et al . 1987 ), lyonsite Cu 3+ х (Fe 3+ 4–2 x Cu 2 x )(VO 4 ) 6 , with 0 ≤ x ≤ 1 ( Hughes et al . 1987a ), mcbirneyite Cu 3 (VO 4 ) 2 ( Hughes et al . 1987b ), and howardevansite NaCu 2+ Fe 3+ 2 (VO 4 ) 3 ( Hughes et al . 1988...

... includes: mcbirneyite, Cu 3 (VO 4 ) 2 ( Hughes et al. 1987a ), blossite, α-Cu 2 V 2 O 7 ( Robinson et al. 1987 ), ziesite, β-Cu 2 V 2 O 7 ( Hughes & Birnie 1980 ), fingerite, Cu 11 O 2 (VO 4 ) 6 ( Hughes & Hadidiacos 1985 ), stoiberite, Cu 5 O 2 (VO 4 ) 2 ( Birnie & Hughes 1979...

... Cu 2 x )(VO 4 ) 6 , with 0 ≤ x ≤ 1 ( Hughes et al. , 1987a ), mcbirneyite Cu 3 (VO 4 ) 2 ( Hughes et al. , 1987b ), and howardevansite NaCuFe 3+ 2 (VO 4 ) 3 ( Hughes et al. , 1988 ). Copper vanadates discovered in Tolbachik fumaroles are leningradite PbCu 3 (VO 4 ) 2 Cl 2 ( Vergasova et...

... Izalco volcano, El Salvador Hughes et al. (1987 b ) Mcbirneyite Cu 3 (VO 4 ) 2 Izalco volcano, El Salvador Hughes et al. (1987 a ) Schäferite NaCa 2 Mg 2 (VO 4 ) 3 Bellerberg ancient volcano, Eifel Krause et al. (1999) Shcherbinaite V 2 O 5 Bezymyanniy volcano, Kamchatka...

.... ( 1980 ): Ziesite, β-Cu 2 V 2 O 7 , a new copper vanadate and fumarole temperature indicator . Am. Mineral . 65 , 1146 – 1149 . Hughes , J.M. , Christian , B.S. , Finger , L.W. & Malinconico , L.L. ( 1987 b): Mcbirneyite, Cu 3 (VO 4 ) 2 , a new sublimate mineral from...

... 12 X TEM-identified nanomineral allendeite Sc 4 Zr 3 O 12 X X TEM-identified nanomineral fingerite Cu 11 O 2 (VO 4 ) 6 X X X X Ephemeral fumarole Cu + V mineral mcbirneyite Cu 3 (VO 4 ) 2 X X X X Ephemeral fumarole Cu + V mineral stoiberite Cu 5 O 2 (VO 4 ) 2...

... describes the behaviour of solids under heating. For instance, Ismagilova et al. ( 2021 ) noticed that there are two natural Cu 3 (VO 4 ) 2 polymorphs, pseudolyonsite and mcbirneyite, that correspond to high- and low-temperature modifications, respectively, which conforms well with their densities, 4.71...

... with hematite, piypite, alumoklyuchevskite, steklite, sanidine (including its As-bearing variety), lammerite, mcbirneyite, starovaite, lyonsite, pseudolyonsite, averievite, cupromolybdite, corundum, and minerals of the langbeinite–calciolangbeinite, lammerite-β–borisenkoite, bradaczekite–zincobradaczekite...

..., and incomplete data: ansermetite, averievite, blossite, calciovolborthite, calderonite, èechite, chervetite, clinobisvanite, curienite, dreyerite, fervanite, fianelite, fritzscheite, gottlobite, howardevansite, kolovratite, kombatite, krettnichite, leningradite, lyonsite, margaritasite, mcbirneyite...

.... (2018) stated that the absence of hydrogen is their most defining chemical feature. For instance, these authors considered a few anhydrous minerals to belong to this type, such as vanadates [blossite, fingerite, leningradite, mcbirneyite, kainotropite, etc., along with starovaite; Pekov et al. (2013...

..., there are 22 minerals that were first discovered in fumaroles of other volcanoes (bannermanite, blossite, heklaite, hieratite, dolerophanite, carobbiite, knasibfite, leonardsenite, lyonsite, litidionite, mcbirneyite, melanothallite, mitcherlichite, nickenichite, fingerite, chalcocyanite, chlorothionite...

... ). Typical analyses of the V-rich lammerite-β (17.1–17.8 wt% V 2 O 5  = 0.84–0.86 V apfu ) are given in Table S1, ##15–16. The triclinic stranskiite-type modification of Cu 3 (AsO 4 ) 2 is also V-enriched (11.6 wt% V 2 O 5  = 0.57 V apfu : #17 in Table S1), being isostructural with mcbirneyite Cu 3 (VO 4...