Preliminary Note on Kimzeyite, a New Zirconium Garnet

Abstract

in cross section, and by their relatively low cells. Henle's loop and the collecting tubules were recognized in the medullary ray and in the medulla; in the papilla, collecting tubules only were found. When the various parts of the kidney had been identified in the stained section, they were dissected out of the adjacent unstained section with microscalpels under a dissection microscope (magnification x40).Separate dissection of Henle's loops and collecting tubules was rarely possible because of their intimate anatomical relationship.The dissected specimens were weighed on a quartz fiber fish-pole balance (sensitivity 0.4 m,gg; useful range 10 to 100 mpeg) (2). A manipulator made from a microscope mechanical stage was used to load and unload the balance pan. A horizontal microscope fitted with a vertical fine adjustment was used to read the displacement of the pan. Under the dissection microscope, each of the weighed specimens was transferred to the bottom of micro test tubes (inside diameter, 3 mm) by a fine glass needle. Both dissection and weighing were done in a room maintained at low humidity and relatively constant temperature. The specimens were assayed to determine alkaline phosphatase activity by adding 3 .l of substrate reagent [0.5M 2-amino-2-methylpropanol-1 (pH 10.0), 8 mmole/lit of p-nitrophenylphosphate, 2 mmole/lit of 1M MgCl2, and 0.05-percent bovine serum albumin (3)]. After 1 hour of incubation at 37?C, the reaction was stopped and color was developed by adding 50 t1 of 0.1N NaOH. The optical density of the solution was read in Lowry-Bessey microcuvettes (4) at 410 m.u in the Beckman DU spectrophotometer, and the results were expressed in moles of substrate split per kilogram (dry weight) per hour.Typical data for individual kidneys of dog, rat, and man are shown in Table 1. The results within each species were consistent, although somewhat different distributions were found in the tubules of each species. The experimental reproducibility for renal homogenates, expressed as standard deviation, was found to be +0.8 moles split per kilogram

Zr-rich garnet and Zr- and Th-rich perovskite from the Polino carbonatite, Italy

“…i is the type kimzeyite from Magnet Cove, for which the analysis of Milton et al (1961) (Fig. 1, point A) lies somewhat off the general trend.…”

“…To check this, new analyses were undertaken of Magnet Cove kimzeyite from the Natural History Museum, London, collection (BM 1963, 392). An average of the new analyses is given in Table 1 together with the original analysis of Milton et al (1961) In comparison with the Zr-rich garnets from Polino, kimzeyite from Magnet Cove has higher concentrations of Zr, A1 and Nb, but is lower in Mg, Si, Ti and the REE.…”

Recession of an EB‐PVDYSZ Coated Turbine Blade by CaSO4 and Fe, Ti‐Rich CMAS‐Type Deposits

“…Instead, a single phase layer of kimzeyite is formed. Kimzeyite, the only natural Ca-garnet containing Zr as a major constituent, is a rare accessory mineral from carbonatite rocks 14 and has triggered interest as a potential nuclear waste storage material. 15 Although ternary Ca-Zrsilicates may also occur in specific regions of turbine blades, 11,16 it was not before this work that the significance of the garnet phase has been fully recognized in the context of turbine airfoil recession.…”

Petrography and mineral chemistry of carbonatites and mica-rich rocks from the Araxá complex (Alto Paranaíba Province, Brazil)

“…A second Ti-andradite phase, but containing a large amount of ZrO 2 (11.3%), is also present. Acccord- ing to the literature (Milton et al 1961), the mineral can be more properly named ferric-kimzeyite.…”