Djerfisherite, Alkali Copper-Iron Sulfide: A New Mineral from Enstatite Chondrites

Fuchs, Louis H.

doi:10.1126/science.153.3732.166

Cited by 107 publications

(36 citation statements)

References 3 publications

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“…Egerton aubrite (Casanova et al, 1993). Djerfisherite is a common accessory phase in enstatite chondrites (Fuchs, 1966;El Goresy et al, 1988;Ikeda, 1989). Two brezinaite grains, 3-7 µm in size, were found in Cochabamba.…”

Section: Modes Of Occurrencementioning

confidence: 99%

Phosphorus-bearing sulfides and their associations in CM chondrites

et al. 2009

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-Phosphorus-bearing Fe and Ni sulfides represent a new type of phosphorus compounds and are characteristic accessory phases of CM chondrites. The proportions of atoms in the sulfides can be approximated by the equation (Fe + Ni)/P = 0.965 ± 0.003 (1 σ ) · S / P + 1.255 ± 0.036 (1 σ ) . Sulfides with high S/P ratios are systematically richer in Fe and poorer in Ni compared with low-S/P sulfides. Their characteristic minor elements are Cr, Ca, Co, K, and Na. The contents of Cr and Ca may reach several weight percent, but their incorporation does not affect the relation between (Fe + Ni)/P and S/P. This is also true of light elements (O and H), which probably occur in the P-bearing sulfides in certain amounts. The sulfides are usually associated with schreibersite, barringerite, eskolaite, and daubreelite. A negative correlation was observed between the Fe/Ni ratios of coexisting P-bearing sulfides and phosphides. Metallic iron was never found in association with the sulfides. It can be suggested that P-bearing sulfide is a primary phase rather than a secondary alteration product formed under the conditions of the CM chondrite parent body. This phase had to be stable in the solar nebula after the formation of Ca-Al inclusions and before the condensation of Fe-Ni metal. At high temperatures, P-bearing sulfide with low Fe/Ni and S/P ratios coexists with schreibersite in the solar gas. During condensation schreibersite is replaced by barringerite, which is accompanied by a decrease in the Fe/Ni ratio of phosphides and an increase in the S/P and Fe/Ni ratios of P-bearing sulfides. Trace element data suggest that the P-bearing sulfides could be formed in the solar nebula by the sulfidization of a precursor phase of extrasolar origin.

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Section: Modes Of Occurrencementioning

confidence: 99%

Phosphorus-bearing sulfides and their associations in CM chondrites

et al. 2009

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“…Number of atoms per formula unit was calculated on the basis of 58 atoms per formula unit according to Tani (1977) and Czamanske et al (1979). Clarke et al, 1977), 2: carbonatite, Kovdor, Russia (Henderson et al, 1999), 3: alkaline peridotite, Inagli, Siberia (Henderson et al, 1999), 4: St. Marks meteorite (Fuchs, 1966), 5: Salmagorsky complex, Kola peninsula, Russia (Barkov et al, 1997), 6: mafic, alkalic, diatreme at Coyote Peak, California (Czamanske et al, 1981), 7: kimberlite, Yakutia, Russia (Henderson et al, 1999), 8: Elwin Bay kimberlite, Somerset Island, Northwest Territories, Canada (Clarke et al, 1994). 5.51 to 5.86 with the averaged value of 5.73 (Table 1).…”

Section: Chemical Compositions Of Djerfisherite and Related Mineralsmentioning

confidence: 99%

“…Djerfisherite, a cubic K-bearing rare sulfide, ideally K 6 Na(Fe, Ni, Cu) 24 S 26 Cl (Czamanske et al, 1979) or K 6 (Fe, Ni, Cu) 25 S 26 Cl (Henderson et al, 1999), was first described by Fuchs (1966) as a formula K 3 (Na, Cu) (Fe, Ni) 12 S 14 in enstatite chondrite. The mineral was subsequently found in several terrestrial samples including kimberlite, mafic xenolithes in kimberlite, peralkaline ultramafic, mafic and syenitic rocks, carbonatitic rocks, contact-metamorphosed calcareous rocks, and several types of sulfide deposits (Clarke et al, 1994;Henderson et al, 1999, and references therein).…”

Section: Introductionmentioning

confidence: 99%

“…The mineral was subsequently found in several terrestrial samples including kimberlite, mafic xenolithes in kimberlite, peralkaline ultramafic, mafic and syenitic rocks, carbonatitic rocks, contact-metamorphosed calcareous rocks, and several types of sulfide deposits (Clarke et al, 1994;Henderson et al, 1999, and references therein). Fuchs (1966) detected about 1wt% Cl on the microprobe analysis, but excluded the element from his chemical formula as being due to contaminant. El Goresy et al (1971), however, demonstrated that Cl is definitely incorporated in the crystal structure.…”

Section: Introductionmentioning

confidence: 99%

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Nickel–bearing Djerfisherite in Gehlenite‐Spurrite Skarn at Kushiro, Hiroshima Prefecture, Japan

et al. 2000

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Djerfisherite occurs intimately intergrown with troilite and pentlandite in gehlenite-spurrite skarn at Kushiro, mainly as inclusions in gehlenite and andradite grains. The mode of occurrence indicates that the djerfisherite formed in the culminated stage of the contact metamorphic-metasomatic process. The chemical compositions of the mineral are approximately represented by a formula of K 6 Na(Fe,Ni,Cu) 24 S 26 Cl with Ni up to 4.85. It is likely that high temperature condition corresponding to the formation of gehlenite-spurrite skarn as well as low f O 2 and f S 2 conditions are responsible for the formation of djerfisherite in the potassium-rich chemical environments.

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“…Optically they are nearly indistinguish able, and Table 4 shows that they are very similar chemically as well, the main difference being recognized in the chlorine content. Where as the variety occurring in specks is with minor differences chemically identical to the mineral djerfisherite found in enstatite meteorites (FUCHS, 1966), and the I A iron Toluca (EL GORESY et al, 1971), the rim mineral occurring along the phosphate interface does not contain appreciable amounts of chlorine.…”

Section: ) Phosphatesmentioning

confidence: 99%

Cape York: The extraordinary mineralogy of an ordinary iron meteorite and its implication for the genesis of III AB irons.

1977

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A study of accessory minerals in the Cape York iron meteorite has been carried out with the electron microprobe. Phases analyzed include chromite, sphalerite, two closely related potassium-bearing sulfides, silica, and native copper. In addition, four phosphate minerals were found: One chemically similar to buchwaldite, but rather rich in iron, one corresponding to terrestrial maricite, and two more, which seem to be new minerals on the basis of microprobe analysis. Evidence from the composition of accessory minerals as well as texture elucidates some details of the fractional crystallization of the group III AB parent melt. A modification of the fractional crystallization model is therefore proposed. We suggest that sulfide nodules have originated as droplets of an immiscible sulfur-rich liquid that continuously segregated from the parent melt during crystallization of the metal. The modified model also explains the Ni/Cr anticorrelation and the high abundance of sulfur in group III AB irons which could not be satisfactorily explained by previous models.

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Djerfisherite, Alkali Copper-Iron Sulfide: A New Mineral from Enstatite Chondrites

Cited by 107 publications

References 3 publications

Phosphorus-bearing sulfides and their associations in CM chondrites

Phosphorus-bearing sulfides and their associations in CM chondrites

Nickel–bearing Djerfisherite in Gehlenite‐Spurrite Skarn at Kushiro, Hiroshima Prefecture, Japan

Cape York: The extraordinary mineralogy of an ordinary iron meteorite and its implication for the genesis of III AB irons.

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