Pyromorphite: Difference between revisions

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== History ==
== History ==
The mineral was first distinguished chemically by [[Martin Heinrich Klaproth|M. H. Klaproth]] in 1784,<ref>{{cite book| author = Klaproth | year = 1784 | url = https://books.google.com/books?id=lqU5AAAAcAAJ&pg=PA390 | title = Von dem Wassereisen, als einem mit Phosphorsäure verbundenen Eisenkalke | quote = On hydrosiderum [i.e., iron phosphide, Fe<sub>2</sub>P] as a calcined [i.e., roasted] iron [that is] bonded with phosphoric acid), ''Chemische Annalen für die Freunde der Naturlehre'' …, '''1''' (5) : 390–399.  From p. 394:  After remarking that lead ores that contain phosphorus can be treated with strong acids to produce phosphoric acid, Klaproth notes that:  ''" … wie solches zuerst Hr. Gahn in Schweden entdeckt, ich selbst aber bey Unersuchung des krystallisirten grünen Bleyerzes von der heil. Dreyfaltigkeit zu Zschopau bestätigt gefunden habe."''  ( … as such Mr. Gahn in Sweden first discovered, I myself, however, have found [to be] confirmed by investigation of the crystallized green lead ore [i.e., pyromorphite] from the Holy Trinity at [[Zschopau]] in Germany] | language = de}}</ref><ref>Details of Klaproth's chemical analysis of pyromorphite appear in: Klaproth (1785) [https://books.google.com/books?id=NYjBkHlP7CIC&pg=RA1-PA13 "Ueber die Phosphorsäure im Zschopauer grünen Bleyspathe"] (On phosphoric acid in green lead spar from Zschopau), ''Beyträge zu den chemischen Annalen'', '''1''' (1) :  13–21.</ref><ref>{{cite book | url = https://books.google.com/books?id=8A8KAAAAIAAJ&pg=PA146 | title = LXXXVII. Chemische Untersuchung der phosphorsauren Bleierze: I. Zeisiggrünes Bleierz von Zschopau. (87. Chemical investigation of the lead ores [containing] phosphoric acid: I. Siskin-green lead ore from Zschopau) in: Klaproth, Martin Heinrich, ''Beiträge zur chemischen Kenntnis der Mineralkörper'' [Contributions to our chemical knowledge of minerals] | location = Posen, (Germany): Decker und Co.; Berlin, Germany | publisher = Heinrich August Rottmann | year = 1802 | volume =  3 | pages = 146–153}}</ref><ref>{{cite web | url = http://tw.strahlen.org/typloc/pyromorphit.html | title= Entdeckung von Pyromorphit'' (Discovery of pyromorphite) | author = Dr. Thomas Witzke | language = de}}</ref> and it was named pyromorphite by [[Johann Friedrich Ludwig Hausmann|J. F. L. Hausmann]] in 1813.<ref>{{cite book | last = Hausmann | first = Johann Friedrich Ludwig | title= Handbuch der Mineralogie | location = Göttingen, Germany | publisher = Vandenhoeck und Ruprecht | year = 1813 | url = https://babel.hathitrust.org/cgi/pt?id=nyp.33433062733062;view=1up;seq=1114 | pages = 1090–1093}}</ref><ref>{{cite book | last = Chester | first = Albert Huntington | title = A Dictionary of the Names of Minerals Including Their History and Etymology | location =New York, New York | publisher = John Wiley & Sons | year =1896 | url = https://books.google.com/books?id=IiwFAAAAMAAJ&pg=PA224 | page = 224}}</ref> The name is derived from the Greek for ''pyr'' (fire) and ''morfe'' (form) due to its crystallization behavior after being melted.<ref name="Webmin" />
The mineral was first distinguished chemically by [[Martin Heinrich Klaproth|M. H. Klaproth]] in 1784,<ref>{{cite book| author = Klaproth | year = 1784 | url = https://books.google.com/books?id=lqU5AAAAcAAJ&pg=PA390 | title = Von dem Wassereisen, als einem mit Phosphorsäure verbundenen Eisenkalke | quote = On hydrosiderum [i.e., iron phosphide, Fe<sub>2</sub>P] as a calcined [i.e., roasted] iron [that is] bonded with phosphoric acid), ''Chemische Annalen für die Freunde der Naturlehre'' …, '''1''' (5) : 390–399.  From p. 394:  After remarking that lead ores that contain phosphorus can be treated with strong acids to produce phosphoric acid, Klaproth notes that:  ''" … wie solches zuerst Hr. Gahn in Schweden entdeckt, ich selbst aber bey Unersuchung des krystallisirten grünen Bleyerzes von der heil. Dreyfaltigkeit zu Zschopau bestätigt gefunden habe."''  ( … as such Mr. Gahn in Sweden first discovered, I myself, however, have found [to be] confirmed by investigation of the crystallized green lead ore [i.e., pyromorphite] from the Holy Trinity at [[Zschopau]] in Germany] | language = de}}</ref><ref>Details of Klaproth's chemical analysis of pyromorphite appear in: Klaproth (1785) [https://books.google.com/books?id=NYjBkHlP7CIC&pg=RA1-PA13 "Ueber die Phosphorsäure im Zschopauer grünen Bleyspathe"] (On phosphoric acid in green lead spar from Zschopau), ''Beyträge zu den chemischen Annalen'', '''1''' (1) :  13–21.</ref><ref>{{cite book | url = https://books.google.com/books?id=8A8KAAAAIAAJ&pg=PA146 | title = LXXXVII. Chemische Untersuchung der phosphorsauren Bleierze: I. Zeisiggrünes Bleierz von Zschopau. (87. Chemical investigation of the lead ores [containing] phosphoric acid: I. Siskin-green lead ore from Zschopau) in: Klaproth, Martin Heinrich, ''Beiträge zur chemischen Kenntnis der Mineralkörper'' [Contributions to our chemical knowledge of minerals] | location = Posen, (Germany): Decker und Co.; Berlin, Germany | publisher = Heinrich August Rottmann | year = 1802 | volume =  3 | pages = 146–153}}</ref><ref>{{cite web | url = http://tw.strahlen.org/typloc/pyromorphit.html | title= ''Entdeckung von Pyromorphit'' (Discovery of pyromorphite) | author = Dr. Thomas Witzke | language = de}}</ref> and it was named pyromorphite by [[Johann Friedrich Ludwig Hausmann|J. F. L. Hausmann]] in 1813.<ref>{{cite book | last = Hausmann | first = Johann Friedrich Ludwig | title= Handbuch der Mineralogie | location = Göttingen, Germany | publisher = Vandenhoeck und Ruprecht | year = 1813 | url = https://babel.hathitrust.org/cgi/pt?id=nyp.33433062733062;view=1up;seq=1114 | pages = 1090–1093}}</ref><ref>{{cite book | last = Chester | first = Albert Huntington | title = A Dictionary of the Names of Minerals Including Their History and Etymology | location =New York, New York | publisher = John Wiley & Sons | year =1896 | url = https://books.google.com/books?id=IiwFAAAAMAAJ&pg=PA224 | page = 224}}</ref> The name is derived from the Greek for ''pyr'' (fire) and ''morfe'' (form) due to its crystallization behavior after being melted.<ref name="Webmin" />


==Properties==
==Properties==

Latest revision as of 18:50, 5 December 2025

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Pyromorphite is a mineral species composed of lead chlorophosphate: Pb5(PO4)3Cl, sometimes occurring in sufficient abundance to be mined as an ore of lead.[1] Crystals are common, and have the form of a hexagonal prism terminated by the basal planes, sometimes combined with narrow faces of a hexagonal pyramid.[2] Crystals with a barrel-like curvature are not uncommon. Globular and reniform masses are also found.[3]

Pyromorphite is part of the apatite group of minerals and bears a close resemblance physically and chemically with two other minerals: mimetite (Pb5(AsO4)3Cl) and vanadinite (Pb5(VO4)3Cl).[4] The resemblance in external characters is so close that, as a rule, it is only possible to distinguish between them by chemical tests. They were formerly confused under the names green lead ore and brown lead ore (German: Grünbleierz and Braunbleierz).Script error: No such module "Unsubst".

History

The mineral was first distinguished chemically by M. H. Klaproth in 1784,[5][6][7][8] and it was named pyromorphite by J. F. L. Hausmann in 1813.[9][10] The name is derived from the Greek for pyr (fire) and morfe (form) due to its crystallization behavior after being melted.[11]

Properties

The color of the mineral is usually some bright shade of green, yellow or brown, and the luster is resinous. The hardness is 3.5 to 4, and the specific gravity between 6.5 and 7.1.[3]

Isomorphism

Owing to isomorphous replacement of the phosphorus by arsenic there may be a gradual passage from pyromorphite to mimetite. Varieties containing calcium isomorphously replacing lead are lower in density (specific gravity 5.9–6.5) and usually lighter in color; they bear the names polysphaerite (because of the globular form), miesite from Stříbro (pronounced Mies in German) in Bohemia, nussierite from Nuizière, Chénelette, near Beaujeu, Rhône, France, and cherokine from Cherokee County in Georgia.[12]

Biology

Paecilomyces javanicus is a fungus collected from a lead-polluted soil that is able to form biominerals of pyromorphite.[13]

Gallery

See also

References

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  6. ↑ Details of Klaproth's chemical analysis of pyromorphite appear in: Klaproth (1785) "Ueber die Phosphorsäure im Zschopauer grünen Bleyspathe" (On phosphoric acid in green lead spar from Zschopau), Beyträge zu den chemischen Annalen, 1 (1) : 13–21.
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  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".

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External links

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