Κυανοτριχίτης

Κυανοτριχίτης
Κυανοτριχίτης(μπλε) . Προέλευση: Αριζόνα, ΗΠΑ
Γενικά
ΚατηγορίαΘειικά
Χημικός τύποςCu4Al2SO4(OH)12 . 2 H2O
Ορυκτολογικά χαρακτηριστικά
Πυκνότητα2,76 gr/cm3
ΧρώμαΈντονο μπλε
Σύστημα κρυστάλλωσηςΡομβικό
ΚρύσταλλοιΛεπτοί με μήκος μέχρι 3 cm, προσομοιάζουν με τρίχες
ΥφήΙνώδης, φλοιώδης. Συνήθως σε βαμβακοειδείς ή ακτινωτές συσσωματώσεις
ΔιδυμίαΌχι
Σκληρότητα2,9
ΣχισμόςΌχι
ΘραύσηΑνώμαλη
ΛάμψηΜεταξώδης
Γραμμή κόνεωςΑνοικτό κυανό
ΠλεοχρωισμόςΌχι έντονος. Χ=άχρωμος, Υ = ανοικτό κυανό, Ζ= έντονο μπλε[1]
ΔιαφάνειαΔιαφανής, ημιδιαφανής
ΠαρατηρήσειςΔιαλυτός σε οξέα

Ο κυανοτριχίτης (αγγλ. cyanotrichite, γαλλ. Cuivre Velouté) είναι ένυδρο θειικό ορυκτό του χαλκού και του αργιλίου. Έλαβε το όνομά του από το χρώμα του (κυανό) και τις συσσωματώσεις που θυμίζουν έντονα ατημέλητα μαλλιά (τρίχες).

Εμφάνιση, παραγενέσεις

Ανευρίσκεται ως δευτερογενές, μάλλον σπάνιο, ορυκτό σε ζώνες οξείδωσης θειούχων μεταλλευμάτων του χαλκού.

Σχετίζεται με μαλαχίτη, αζουρίτη, βροσαντίτη, σμιθσονίτη, χαλκοφυλλίτη και ολιβινίτη.

Απαντά σε αρκετές περιοχές της Γης κύρια σε ζώνες οξείδωσης ορυχείων μεταλλευμάτων χαλκού. Πολύ όμορφα δείγματά του απαντούν στη Μολδαβία, στο ορυχείο Cap Garonne στη Γαλλία, σε αρκετά ορυχεία της Κορνουάλλης Βρετανία), στη Σαρδηνία, τα Ουράλια όρη στη Ρωσία, στην Αυστρία, την Καταλωνία (Ισπανία), τη Βεστφαλία (Γερμανία), το Καζακστάν, στις ΗΠΑ (Πολιτείες Αριζόνα Νέο Μεξικό, Γιούτα, Νεβάδα) και την Ατακάμα της Χιλής.

Στην Ελλάδα ανευρίσκονται όμορφα δείγματά του στα περισσότερα μεταλλεία Λαυρίου.

Πηγές

Δείτε επίσης

Βιβλιογραφία

  • James Dwight Dana, Manual of Mineralogy and Lithology, Containing the Elements of the Science of Minerals and Rocks, READ BOOKS, 2008 ISBN 1443742244
  • Frederick H. Pough, Roger Tory Peterson, Jeffrey (PHT) Scovil, A Field Guide to Rocks and Minerals, Houghton Mifflin Harcourt, 1988 ISBN 039591096X
  • Walter Schumann, R. Bradshaw, K. A. G. Mills, Handbook of Rocks, Minerals and Gemstones, Houghton Mifflin Harcourt, 1993 ISBN 0395511372

Σημειώσεις

  1. ↑ Στον ιστοχώρο Webmineral αναφέρεται ότι δεν εμφανίζει πλεοχρωισμό

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