Author
F. A. Hummel
Bio: F. A. Hummel is an academic researcher from University of Pennsylvania. The author has contributed to research in topics: Uvarovite. The author has an hindex of 2, co-authored 2 publications receiving 29 citations.
Topics: Uvarovite
Papers
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16 citations
Journal Article•
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TL;DR: In this paper, it was shown that the kidney stones can be decomposed at temperatures below 40°C and at around 80°C if more rapid heating is employed, respectively.
Abstract: Struvite (NH4MgPO4·6H2O) is a mineral often found in urinary tracts and kidneys. Thermal decomposition using slow low heating shows that the 'kidney' stone can be decomposed at temperatures below 40°C. At this temperature both ammonia and water are evolved. If more rapid heating is employed the decomposition occurs at around 80°C. The implication of this work rests with the use of low slow heat for the decomposition of the kidney stones.
120 citations
TL;DR: The crystal structure of Mg2P2O7 reported by Lukaszewicz has been refined by least squares analysis as discussed by the authors, using data of the hkl type with O( √ k/k/k)≤ 6.
Abstract: The crystal structure of Mg2P2O7 reported by Lukaszewicz has been refined by least squares analysis. Data of the hkl type with O ≤ k ≤ 6 have been used to obtain improved atomic parameters. The cen...
68 citations
TL;DR: In this paper, the phase equilibrium diagram shows relations at liquidus temperatures for all but the high-lime part of the system, where the omitted part chromium in the mixtures oxidizes in air to higher valence forms.
Abstract: Results are presented of a study in air of mixtures in the system CaO-Cr2O3-SiO2. The phase equilibrium diagram shows relations at liquidus temperatures for all but the high-lime part of the system. In this omitted part chromium in the mixtures oxidizes in air to higher valence forms. The compound Ca3Cr2Si3O12 (uvarovite) occurs at subsolidus temperatures, decomposing at 1370°C. to α-CaSiO3 and Cr2O3. The inhibiting action of chromium oxide on the inversion of high-temperature forms of Ca2SiO4 to the low-temperature γ-Ca2SiO4 is discussed in the light of new data. Evidence is presented for the existence of a pentavalent chromium compound, Ca3(CrO4)2, having solid-solution relations with Ca3SiO4.
66 citations
TL;DR: In this paper, solid-solid reactions in MgO V 2 O 5 mixtures of various stoichiometries were investigated and three compounds were obtained, viz., Mg3V2O8, Mg2V 2O7, and MgV2E6, and their space group and cell parameters were deduced from the X-ray powder diffraction pattern.
53 citations
TL;DR: Electron probe analyses of garnets that are rich in magnesium and that occur as inclusions in natural diamonds show that the chrome-garnet end member, Mg3Cr2Si3O12, is a major constituent (30 percent).
Abstract: Electron probe analyses of garnets that are rich in magnesium and that occur as inclusions in natural diamonds show that the chrome-garnet end member, Mg3Cr2Si3O12, is a major constituent (30 percent).
53 citations