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Isokite from
Assunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal


Locality type:Mine
Classification
Species:Isokite
Formula:CaMg(PO4)F
Comments:Isokite, CaMg[F|PO4], from Senhora de Assunção, Portugal: New Find and new Data (2008).
Rupert Hochleitner and Karl Thomas Fehr, München.
Abstract: Isokite, CaMg[F|PO4], from a newly discovered occurrence in the pegmatite of Senhora de Assunção, Portugal, is described. In contradiction to previous descriptions (Deans et al. 1955, Fisher 1957, Deans 1958 ) the newly found isokite does not form whitish earthy crusts but massive brownish or greyish masses and veins in contact to triplite. Paragenesis and age relations show that Assunção isokite grows at the expense of earlier formed triplite. The FTIR spectrum of isokite is presented for the first time (observed bands at 456, 475, 564, 594, 649, 952, 1005, 1039, 1075, 1124 cm-1) , chemical and X-ray diffraction data are given (a = 6.527±0.005 Å, b = 8.744±0.005 Å, c = 7.501±0.006 Å and β = 121.34±0.009 °) and the formation of isokite in pegmatites is discussed.
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Analysis Reference:Rui Nunes collection
Associated Minerals Based on Photo Data:
Triplite2 photos of Isokite associated with Triplite at this locality.
Data
Mineral Data:Click here to view Isokite data
Locality Data:Click here to view Assunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal
Photo GalleryView Gallery (4 photos)
Data Identifiers
Mindat Occurrence Record ID:367813
Long-form Identifier:1:3:367813:8
GUID (UUID V4):0df47f86-e63b-48ca-8340-4428d7e87e7f
Nearest other occurrences of Isokite
12.2km (7.6 miles) Venturinha, Sezures, Penalva do Castelo, Viseu, Portugal
28.5km (17.7 miles) Cubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal
36.1km (22.4 miles) Sítio do Castelo Mine, Folgosinho, Gouveia, Guarda, Portugal
74.9km (46.5 miles) Barroca Grande Mine, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Portugal
References
Reference Search (possible matching items)
Journal (article/letter/editorial)
Verlagsbuchhandlung 2005 Isokite, CaMg[F|PO4], from Senhora de Assunção, Portugal: new find and new data...Abstract: Isokite, CaMg[F|PO4], from a newly discovered occurrence in the pegmatite of Senhora de Assunção...Assunção, Portugal, is described. In contradiction to previous descriptions (Deans et al. 1955, Fisher 1957...1957, Deans 1958) the newly found isokite does not form whitish earthy crusts but massive brownish or greyish...that Assunção isokite grows at the expense of earlier formed triplite. The FTIR spectrum of isokite is
Report (issue)
Isokite CaMg(PO4)F Crystal Data: Monoclinic. Point Group: 2/m. Crystals are flattened on {010}, elongated...triplite in granite pegmatite (Mangualde and Ribeira, Portugal; Horní Slavkov, Czech Republic). Association:...Republic. In Portugal, at the Mangualde pegmatite, near Mesquitela, from Folgorinho, from Senhora de Assunção...Assunção quarry, at Aldeia Nova, Satao, and in the Ribeira and Panasqueira Sn-W deposits. From the Bayan Obo...References: (1) Deans, T. and J.D.C. McConnell (1955) Isokite, CaMgPO4F, a new mineral from Northern Rhodesia
Journal (article/letter/editorial)
Theye (2005) A new cobalt mineral from the Sophia mine near Wittichen, Central Black Forest. Der Erzgräber...Oligocene-Miocene alpine cleft veins near Cleuson, Val de Nendaz, Valais. The following minerals are also found...belongs to the secondary assemblage of the Sophia mine near Wittichen, Central Black Forest, Germany. It... Na2Cu(CO3)2, a new mineral from the Santa Rosa mine, Atacama desert, Chile. N. Jb. Miner. Abh., 182...discovered in the oxidation zone of the Santa Rosa mine in the Atamaca desert in northern Chile, near the
Journal (article/letter/editorial)
Segnitit-Plumbojarosit-Kintoreit-Mischkristalle aus Portugal. Beih. z. European J. Miner. 8: 109. Hoffmann...Hochleitner, R., Fehr, K.T. & Rewitzer, C. (2003): Isokite – new occurrence and new data. DMG-Jahrestagung...Raman-spectroscopy. Abstract, IUGG/IAGA, 2003, Sapporo. De Campos, C.P., Dingwell, D.B. & Fehr, K.T. (2004):...Earth and Planetary Science Letters 221: 71– 89. De Campos, C.P., Dingwell, D.B. & Fehr, K.T. (2005):...Hochleitner, R. & Fehr, K.T. (2005): Isokite from Senhora de Assunção, Portugal: new Find and new data. N. Jb
Journal (article/letter/editorial)
fluellite, fluorapatite, frondelite, goyazite, isokite, kolbeckite, leucophosphite, morinite, natrodufrénite...the 5th level of the Huber shaft of the Stannum mine. No indications of historical mining have been found...partly brecciated. At the Xth level of the same mine triplite aggregates (up to some dm in size) occurred...Numerous samples from the 5th level of the Huber mine carry fibrous aggregates, up to 200 µm, which extensively...described by di Cossato et al. (1989) from Mangualde, Portugal, and its fibrous character, suggest that the mineral
 
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