Details

Autor(en) / Beteiligte

• Kampf, Anthony R.
• Olds, Travis A.
• Plášil, Jakub
• Marty, Joe

Titel

Zincorietveldite, Zn(UO 2 )(SO 4 ) 2 (H 2 O) 5 , the zinc analogue of rietveldite from the Blue Lizard mine, San Juan County, Utah, USA

Ist Teil von

• Mineralogical magazine, 2023-08, Vol.87 (4), p.528-533

Ort / Verlag

London: Cambridge University Press

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Abstract The new mineral zincorietveldite (IMA2022-070), Zn(UO 2 )(SO 4 ) 2 (H 2 O) 5 , was found in the Blue Lizard mine, San Juan County, Utah, USA, where it occurs as yellow to orange–yellow blades in a secondary assemblage with bobcookite, coquimbite, halotrichite, libbyite, metavoltine, rhomboclase, römerite, tamarugite and voltaite. The streak is very pale yellow. Crystals are transparent with vitreous lustre. The tenacity is brittle, the Mohs hardness is ~2½ and the fracture is curved. Cleavage is excellent on {010}, good on {100} and fair on {001}. The mineral is easily soluble in H 2 O and has a calculated density of 3.376 g⋅cm –3 . The mineral is optically biaxial (+) with α = 1.568(2), β = 1.577(2) and γ = 1.595(2); 2V = 70(1)°. Electron microprobe analyses provided (Zn 0.720 Mg 0.109 Fe 0.091 Mn 0.046 Co 0.035 ) Σ1.00 (UO 2 )(SO 4 ) 2 (H 2 O) 5 . Zincorietveldite is orthorhombic, Pmn 2 1 , a = 12.8712(9), b = 8.3148(4), c = 11.2959(4) Å, V = 1208.90(11) Å 3 and Z = 4. Zincorietveldite is the Zn analogue of rietveldite. The structural unit is a uranyl-sulfate chain that is also found in the structures of bobcookite, oldsite, oppenheimerite and svornostite.