...Roland C. Rouse; Donald R. Peacor Abstract The zeolite mineral maricopaite [Pb 7 Ca 2 Al 12 Si 36 (O,OH) 100 · n (H 2 O,OH)] is orthorhombic, Cm 2 m , with a = 19.434(2), b = 19.702(2), c = 7.538(1) Å, V = 2886.1(7) Å 3 , and Z = 1. The measured and calculated densities are 2.94 and 2.90 g/cm 3...

... (deposition no. R100031). In this paper, we describe the physical and chemical properties of rongibbsite and its structural features determined from single-crystal X-ray diffraction and Raman spectroscopy. Along with the zeolite maricopaite, Ca 2 Pb 7 (Si 36 Al 12 )O 99 · n (H 2 O,OH), found in the same...

... that the cubane-like [Pb 4 (OH) 4 ] 4+ cluster occurs in several synthetic phases and that it is a component of the structure of maricopaite, (Pb 7 Ca 2 )[Al 12 Si 36 (O,OH) 100 ]· n (H 2 O,OH), n ≈ 32 ( Rouse & Peacor 1994 ). They also noted that the similar [Pb 4 (OH) 2 F 2 ] 4+ unit occurs...

..., 1993 ; Grimes et al. , 1995 ). The rarity of minerals containing the Pb 4 (OH) 4 cluster is likely due to the transient nature of pH conditions favouring its stabilisation, as more alkaline conditions develop and new products arise from the continued oxidation of original galena. For maricopaite...

.... The outline of the unit cell is shown in red. Kolitsch & Tillmanns (2003) reviewed Pb-(O,OH) clusters and lead nitrates. They noted that the [Pb 4 (OH) 4 ] 4+ cluster occurs in several synthetic phases besides [Pb 4 (OH) 4 ](NO 3 ) 4 and that it is a component of the structure of maricopaite...

... et al . 1984a ), sverigeite ( Dunn et al . 1984b ), retzian-(La) ( Dunn et al . 1984c ), jerrygibbsite ( Dunn et al . 1984d ), canaphite ( Peacor et al . 1985 ), ferristrunzite ( Peacor et al . 1987 ), maricopaite ( Peacor et al . 1988 ), londonite ( Simmons et al . 2001 ), pezzottaite ( Laurs...

... Society of America, Abstracts with Programs , pp. 720. Rouse R.C. and Peacor D.R. ( 1994 ) Maricopaite, an unusual lead calcium zeolite with an interrupted mordenite...

... phillipsite and harmotome with the same framework (PHI) and symmetry (P21/m) and heulandite and clinoptilolite with the same framework (HEU) and symmetry (C2/m) should be considered different zeolite species. The sharing coefficient of 2 is violated only in three minerals (maricopaite, partheite...

... ). These minerals possess unusual and unique structures due to the adaptation of topology and geometry of silicate (or aluminosilicate) anions to the arrangements of the Pb 2+ cations possessing stereochemically active 6 s 2 lone electron pairs. For instance, the structures of maricopaite, Ca 2 Pb 7 (Si 36 Al 12...

...) the presence of large cations, e.g., Ca 2+ , Ba 2+ , Na + (partheite, roggianite, wenkite, sarcolite, and ussingite), (2) the presence of Be 4+ (bavenite, leifite, and chiavennite), or (3) the presence of large clusters in the structural channels ([Pb 4 (OH) 4 ] 4+ clusters in maricopaite). Thornasite...

...Figure 15. (a) The mordenite (MOR) framework projected along the c -axis. The sheets of six-membered rings parallel to (100) are linked parallel to the a -axis by four-membered rings. (b) The maricopaite (-MOR) framework projected along the c -axis. The unit-cell origin is shifted by 1/2...

... Reviews , 97 , 597 – 636 . Ronay , C. and Seff , K. ( 1993 ) Lead oxide hydroxide clusters in lead hydroxide oxide (Pb 9 O(OH) 4 )-A, zeolite A exchanged with Pb 2+ at pH 6.0 . Zeolites , 13 , 97 – 101 . Rouse , R.C. and Peacor , D.R. ( 1994 ) Maricopaite...

... and maricopaite (e.g., Armbruster and Gunter 2001 ). The Ca1 site in the goosecreekite structure with doubled c axis is coordinated by four framework O and two additional H 2 O molecules (W1: fully occupied and W4 ca. ½ occupied). Ca1B is hydrated by W5 and W2. W5 has occupancy of 0.36 and W2 of 0.52 (sample...