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Delindeite is a very rare mineral in the Lamprophyllite Group, Seidozerite Supergroup. Named in honor of Henry Samuel de Linde; an amateur mineralogist who was the former owner of the Diamond Jo quarry, Arkansas where the mineral was first discovered in 1987.[2] It is a secondary mineral formed under oxidizing conditions from a titianiferous nepheline and syenite.[3]
Mineral information
Delindeite is also a part of a rare group of minerals called titanosilicates. With only around 30 known species’ discovered as of 2025, they are quite diverse. Delindeite specifically is a a part of the Ba titanosilicates.[4]
Later studies questioned the crystal structure of Delindeite, explaining that its original given structure did not fit cleanly with other titanium disilicate structures. It was found that earlier research solved only one subcell, (smaller, repeating units within a mineral’s larger crystal lattice). Delindeite’s central sheet (Octahedral molecular geometry|octahedral (O) sheet) is not a normal trioctahedral close packed sheet (fully occupied layer of 8 faces built on tightly packed oxygen atoms). Instead it’s a distinct, vacancy and is a water bearing layer.[5]
Occurrence and localities
Other than Diamond Jo quarry, only one other location reported an additional occurrence in the California State Gem Mine (Santa Rita Peak, San Benito County, California, US).[1]
References
- ^ a b “Delindeite”. www.mindat.org. 14 December 2025. Retrieved 14 December 2025.
- ^ Appleman, Daniel E.; Evans, Howard T.; Nord, Gordon L.; Dwornik, Edward J.; Milton, Charles (September 1987). “Delindeite titanosilicates and lourenswalsite, two new from the Magnet Cove region, Arkansas”. Mineralogical Magazine. 51 (361): 417–425. doi:10.1180/minmag.1987.051.361.08. Retrieved 14 December 2025.
- ^ “Delindeite Mineral Data”. webmineral.com. 14 December 2025. Retrieved 14 December 2025.
- ^ Ferraris, G.; Ivaldi, G.; Pushcharovsky, D. Yu.; Zubkova, N. V.; Pekov, I. V. (1 October 2001). “The Crystal Structure of Delindeite, Ba2{(Na,K)3(Ti,Fe)[Ti2(O,OH)4Si4O14](H2O,OH)2}, A Member of the Mero-Plesiotype Bafertisite Series”. The Canadian Mineralogist. 39 (5): 1307–1316. doi:10.2113/gscanmin.39.5.1307. Retrieved 14 December 2025.
- ^ Sokolova, E.; Camara, F. (1 October 2007). “From Structure Topology to Chemical Composition. II. Titanium Silicates: Revision of the Crystal Structure and Chemical Formula of Delindeite”. The Canadian Mineralogist. 45 (5): 1247–1261. doi:10.2113/gscanmin.45.5.1247. Retrieved 14 December 2025.
