Optical Spectra of Gillespite, BaFe²⁺Si₄O₁₀

• Burns RG, Clark MG, Stone AJ (1966) Vibronic polarization in the electronic spectra of gillespite, a mineral containing iron(II) in square-​planar coordination. Inorganic Chemistry 5, 1268-72. 
• Strens RGJ (1966) Pressure-​induced spin-​pairing in gillespite. Chemical Communications (London) 1966, 777-8.
• Clark MG, Burns RG (1967) Electronic spectra of copper(II) ion and iron(II) ion square planar coordinated by oxygen in BaXSi₄O₁₀. Journal of the Chemical Society [Section] A:  Inorganic, Physical, Theoretical (1967), 1034-8.
• Abu-eid RM, Burns RG, Mao HK (1973)  Blue high-pressure phase for gillespite.  Transactions of the American Geophysical Union 54, 498.
• Ford RJ, Hitchman MA (1979) Single crystal electronic and EPR spectra of CaCuSi4O10, a synthetic silicate containing copper(II) in a four-​coordinate, planar ligand environment. Inorganica Chimica Acta 33, L167-L170.
• Mackey, DJ, McMeeking RF, Hitchman MA (1979) Magnetic anisotropy and electronic structure of gillespite, a mineral containing planar, four-​coordinate, high-​spin iron(II). Journal of the Chemical Society, Dalton Transactions:  Inorganic Chemistry (1972-1999) (2), 299-305
• C, Zhu H, Liu G (1985) Optical absorption and EPR spectra of barium copper silicate (BaCuSi₄O₁₀). Kuangwu Xuebao 5, 301-6. In Chinese.
• Rossman GR, Taran Mn (2001) Spectroscopic standards for four- and fivefold-coordinated Fe²⁺ in oxygen-based minerals. American Mineralogist 86, 896–903.