| Boxbgcolor |
|
|---|---|
| Category | Sorosilicate minerals, seidozerite supergroup, lamprophyllite group |
| Formula | (Na,K)2(Ba,Ca)2(Ti,Fe,Al)3(Si2O7)2O2(OH)2*2H2O |
| Imasymbol | Dde |
| Molweight | 902.60 g/mol |
| Strunz | 9.BE.60 |
| Dana | 56.2.6c.2 |
| System | Monoclinic |
| Class | 2/m - Prismatic |
| Symmetry | B2/m (no. 12) |
| Unit cell | 1 |
| Color | Light pinkish-grey to red |
| Habit | Lath-shaped crystals or flakes, forming compact spherulitic aggregates, to 1 mm, some are fibrous |
| Twinning | Submicroscopic on {100} |
| Cleavage | Distinct/Good [001] Good |
| Fracture | Irregular/Uneven |
| Tenacity | Brittle |
| Luster | Resinous, Pearly |
| Streak | White |
| Diaphaneity | Translucent |
| Gravity | 3.3 |
| Opticalprop | Biaxial (+) |
| Refractive | nα = 1.79 nβ = 1.825 nγ = 1.982 |
| Birefringence | δ = 0.192 |
| Pleochroism | Non-pleochroic |
| 2v | Measured: 54°, Calculated: 54° |
| Dispersion | single |
| Impurities | Mg |
| References | [1] |
Delindeite is a very rare titanium sorosilicate mineral in the lamprophyllite group and seidozerite supergroup. It was 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 titanium-bearing nepheline and syenite.[3]
Delindeite is also 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 barium titanosilicate.[4]
Other than Diamond Jo quarry, delindeite has also been found at the California State Gem Mine in San Benito County, California.[1]
References
- ^ "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.