Community hub
Recent from talks
Knowledge base stats:
Talk channels stats:
Members stats:
Segnitite
Segnitite is a lead iron(III) arsenate mineral. Segnitite was first found in the Broken Hill ore deposit in Broken Hill, New South Wales, Australia. In 1991, segnitite was approved as a new mineral. Segnitite has since been found worldwide near similar locality types where rocks are rich in zinc and lead especially. it was named for Australian mineralogist, gemologist and petrologist Edgar Ralph Segnit. The mineral was named after E. R. Segnit due to his contributions to Australian mineralogy.
Segnitite is not a primary ore mineral, but is found amongst other well known ore minerals such as galena, sphalerite, pyrite and more. Many minerals found with segnitite are important for industrial purposes. Minerals associated with segnitite make up metal alloys, batteries and even pigments. Carminite and beudanite are closely related to segnitite. In fact, forms of beudanite are commonly confused with segnitite, as the sulfate and arsenate anions are readily exchangeable with each other. Other mineral relations include, goethite, coronadite, agardite, bayldonite, and mimetite.
Set parameters for the space group and chemical composition have yet to be confirmed. Segnitite has loose boundaries and conclusions about segnitite were derived from associated minerals. Chemically, there are many varieties of segnitite which affects space group measurements and chemical analysis interpretations. In other words, segnitite samples from around the world can be very different from one another making it difficult to provide accurate chemical measurements.[citation needed]
The mineral segnitite is a part of the alunite-jarosite family which is a part of the alunite supergroup, which has a general formula of AB3(TO4)2(OH)6. Minerals in the alunite-jarosite family have the general formula AB3(XO4)2(OH)6. More specifically, Segnitite is a part of the low-S lusungite group of alunite-jarosite minerals. The lusungite group falls on the lower third of the ternary diagram, with the jarosite group on top, having the highest content of sulfur. The beudantite-corkite group lies in the middle third on the ternary diagram, possessing intermediate amounts of sulfur. The lusungite group then has the lowest amount of sulfur, and has end members segnitite and lusungite, which then have varying amounts of arsenic to phosphorus; segnitite is the arsenic rich end member of the lusugnite group.
Through electron microprobe analysis on the basis of 14 oxygen atoms, the empirical formula of segnitite was found to be (Pb1.05Ba0.03)1.08(Fe2.76Zn0.22Al0.17Cu0.01)3.16[(AsO4)1.85(PO4)0.05(SO4)0.04]1.94(OH,H2O)6.24. Four alternative and simplified versions include: (1) PbFe3(AsO4)2(OH)5·H2O, (2) PbFe3(AsO4)2(OH,H2O)6, (3) PbFe3(AsO4)(AsO3OH)(OH)5, (4) PbFe3H(AsO4)2(OH)6, although the preferred formula is PbFe3H(AsO4)2(OH)6, which is most consistent with the space group (R3m) for Segnitite.
Segnitite belongs to the trigonal crystal system, which is also a subcategory of the hexagonal crystal system. Segnitite occurs most commonly as rhombohedral crystals that can grow to around 5mm in height and as pseudo-octahedral crystals that typically measure about 1mm across. The habit of these segnitite clusters is often found to be hemispherical in shape. Rhombohedron {112} and Pinacoid {001} are the two most common forms of segnitite.
Segnitite was first discovered in Broken Hill ore deposit in Broken Hill, New South Wales, Australia. It was first found in the oxidized zone of lead and zinc sulfide ores bodies of the Broken Hill ore deposit and forms in similar settings around the world. Segnitite is a relatively uncommon mineral, and it not found in very large quantities, but is found worldwide in similar areas. Segnitite has since been found in many localities in Western Europe, specifically in sites near Switzerland, Germany and Austria.
Segnitite is commonly found alongside many well known minerals including anglesite, galena, jamesonite, linarite, arsenopyrite, cerussite, covellite, cuprite, sphalerite, sulfur, beudantite, cassiterite, pyrite, smithsonite, carminite and plumbojarosite. Many of these minerals are important ore minerals. Segnitite poses some importance when considering the overall composition of surrounding rock.
Hub AI
Segnitite AI simulator
(@Segnitite_simulator)
Segnitite
Segnitite is a lead iron(III) arsenate mineral. Segnitite was first found in the Broken Hill ore deposit in Broken Hill, New South Wales, Australia. In 1991, segnitite was approved as a new mineral. Segnitite has since been found worldwide near similar locality types where rocks are rich in zinc and lead especially. it was named for Australian mineralogist, gemologist and petrologist Edgar Ralph Segnit. The mineral was named after E. R. Segnit due to his contributions to Australian mineralogy.
Segnitite is not a primary ore mineral, but is found amongst other well known ore minerals such as galena, sphalerite, pyrite and more. Many minerals found with segnitite are important for industrial purposes. Minerals associated with segnitite make up metal alloys, batteries and even pigments. Carminite and beudanite are closely related to segnitite. In fact, forms of beudanite are commonly confused with segnitite, as the sulfate and arsenate anions are readily exchangeable with each other. Other mineral relations include, goethite, coronadite, agardite, bayldonite, and mimetite.
Set parameters for the space group and chemical composition have yet to be confirmed. Segnitite has loose boundaries and conclusions about segnitite were derived from associated minerals. Chemically, there are many varieties of segnitite which affects space group measurements and chemical analysis interpretations. In other words, segnitite samples from around the world can be very different from one another making it difficult to provide accurate chemical measurements.[citation needed]
The mineral segnitite is a part of the alunite-jarosite family which is a part of the alunite supergroup, which has a general formula of AB3(TO4)2(OH)6. Minerals in the alunite-jarosite family have the general formula AB3(XO4)2(OH)6. More specifically, Segnitite is a part of the low-S lusungite group of alunite-jarosite minerals. The lusungite group falls on the lower third of the ternary diagram, with the jarosite group on top, having the highest content of sulfur. The beudantite-corkite group lies in the middle third on the ternary diagram, possessing intermediate amounts of sulfur. The lusungite group then has the lowest amount of sulfur, and has end members segnitite and lusungite, which then have varying amounts of arsenic to phosphorus; segnitite is the arsenic rich end member of the lusugnite group.
Through electron microprobe analysis on the basis of 14 oxygen atoms, the empirical formula of segnitite was found to be (Pb1.05Ba0.03)1.08(Fe2.76Zn0.22Al0.17Cu0.01)3.16[(AsO4)1.85(PO4)0.05(SO4)0.04]1.94(OH,H2O)6.24. Four alternative and simplified versions include: (1) PbFe3(AsO4)2(OH)5·H2O, (2) PbFe3(AsO4)2(OH,H2O)6, (3) PbFe3(AsO4)(AsO3OH)(OH)5, (4) PbFe3H(AsO4)2(OH)6, although the preferred formula is PbFe3H(AsO4)2(OH)6, which is most consistent with the space group (R3m) for Segnitite.
Segnitite belongs to the trigonal crystal system, which is also a subcategory of the hexagonal crystal system. Segnitite occurs most commonly as rhombohedral crystals that can grow to around 5mm in height and as pseudo-octahedral crystals that typically measure about 1mm across. The habit of these segnitite clusters is often found to be hemispherical in shape. Rhombohedron {112} and Pinacoid {001} are the two most common forms of segnitite.
Segnitite was first discovered in Broken Hill ore deposit in Broken Hill, New South Wales, Australia. It was first found in the oxidized zone of lead and zinc sulfide ores bodies of the Broken Hill ore deposit and forms in similar settings around the world. Segnitite is a relatively uncommon mineral, and it not found in very large quantities, but is found worldwide in similar areas. Segnitite has since been found in many localities in Western Europe, specifically in sites near Switzerland, Germany and Austria.
Segnitite is commonly found alongside many well known minerals including anglesite, galena, jamesonite, linarite, arsenopyrite, cerussite, covellite, cuprite, sphalerite, sulfur, beudantite, cassiterite, pyrite, smithsonite, carminite and plumbojarosite. Many of these minerals are important ore minerals. Segnitite poses some importance when considering the overall composition of surrounding rock.