Davyne

Davyne

Mount Somma, Somma-Vesuvius Complex, Naples, Campania, Italy

Davyne

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Davyne, etc.

Vitiello Quarry, Terzigno, Mount Vesuvius, Somma-Vesuvius Complex, Naples, Campania, Italy

Davyne

Mount Somma, Somma-Vesuvius Complex, Naples, Campania, Italy

Davyne

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Davyne, etc.

Vitiello Quarry, Terzigno, Mount Vesuvius, Somma-Vesuvius Complex, Naples, Campania, Italy

Davyne

Mount Somma, Somma-Vesuvius Complex, Naples, Campania, Italy

Davyne

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

About DavyneHide

Sir Humphry Davy

Formula:

(Na,K)₆Ca₂(Al₆Si₆O₂₄)(Cl₂,SO₄)₂

Colour:

Colourless, white

Lustre:

Vitreous

Hardness:

5½ - 6

Specific Gravity:

2.42 - 2.53

Crystal System:

Hexagonal

Member of:

Cancrinite Group > Feldspathoid Group

Name:

Named by T. Monticelli and N. Covelli in 1825 in honor of Sir Humphry Davy (17 December 1778, Penzance, Cornwall, England - 29 May 1829, Geneva, Switzerland), chemist who first isolated potassium, sodium, calcium, strontium, barium, magnesium and boron.

Type Locality:

ⓘ Mount Somma, Somma-Vesuvius Complex, Naples, Campania, Italy

Cancrinite Group.

In the structure there are large channels closed by 12-membered tetrahedra rings. The channels are surrounded by cages, that are set in columns. In the "davyne subgroup" the cages contain [CaCl]⁺ lusters.

Unique IdentifiersHide

IMA Classification of DavyneHide

Classification of DavyneHide

Mineral SymbolsHide

Physical Properties of DavyneHide

Optical Data of DavyneHide

Type:

Uniaxial (+)

RI values:

n_ω = 1.515 - 1.519 n_ε = 1.519 - 1.522

Max Birefringence:

δ = 0.004

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Surface Relief:

Low

Chemistry of DavyneHide

Crystallography of DavyneHide

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0005240	Davyne	Hassan I, Grundy H D (1990) Structure of davyne and implications for stacking faults Sample BM1907,210 The Canadian Mineralogist 28 341-349		1990		0	293
0005241	Davyne	Hassan I, Grundy H D (1990) Structure of davyne and implications for stacking faults Sample 1469 The Canadian Mineralogist 28 341-349		1990		0	293
0012420	Davyne	Rozenberg K A, Rastsvetaeva R K, Chukanov N V (2009) Crystal structures of oxalate-bearing cancrinite with an unusual arrangement of CO3 groups and sulfate-rich davyne Crystallography Reports 54 793-799		2009	Sar-e Sang mine, Badakhshan, Afghanistan	0	293
0014841	Davyne	Bonaccorsi E, Merlino S, Pasero M (1990) Davyne: its structural relationships with cancrinite and vishnevite Neues Jahrbuch fur Mineralogie, Monatshefte 1990 97-112		1990	Monte Somma, Vesuvius, Italy	0	293

CIF Raw Data - click here to closedata_global _chemical_name_mineral 'Davyne' loop_ _publ_author_name 'Hassan I' 'Grundy H D' _journal_name_full 'The Canadian Mineralogist' _journal_volume 28 _journal_year 1990 _journal_page_first 341 _journal_page_last 349 _publ_section_title ; Structure of davyne and implications for stacking faults Sample BM1907,210 ; _database_code_amcsd 0005240 _chemical_formula_sum 'O12 (Al3.09 Si2.91) Cl Ca Na1.65 K.84' _cell_length_a 12.854 _cell_length_b 12.854 _cell_length_c 5.357 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 766.529 _exptl_crystal_density_diffrn 2.181 _symmetry_space_group_name_H-M 'P 63' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x-y,x,1/2+z' '-y,x-y,z' '-x,-y,1/2+z' '-x+y,-x,z' 'y,-x+y,1/2+z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv O1 0.21200 0.42400 0.72400 1.00000 0.01900 O2 0.11200 0.55400 0.74600 1.00000 0.02500 O3 0.00900 0.34000 0.01000 1.00000 0.00700 O4 0.32800 0.34600 0.02500 1.00000 0.03900 AlT1 0.33800 0.41300 0.75100 0.63000 0.01000 SiT1 0.33800 0.41300 0.75100 0.37000 0.01000 SiT2 0.07700 0.41400 0.75000 0.60000 0.01100 AlT2 0.07700 0.41400 0.75000 0.40000 0.01100 Cl 0.66667 0.33333 0.71100 1.00000 0.09100 Ca 0.66667 0.33333 0.21800 1.00000 0.00900 Na 0.15300 0.30800 0.25800 0.55000 0.03800 K 0.11800 0.22800 0.26400 0.28000 0.04900

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Type Occurrence of DavyneHide

Other Language Names for DavyneHide

Varieties of DavyneHide

Relationship of Davyne to other SpeciesHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

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Internet Links for DavyneHide

References for DavyneHide

Localities for DavyneHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Egypt
Red Sea Governorate ⓘ St John's Island	Bonaccorsi E. et al. (1991)
Germany
Rhineland-Palatinate Ahrweiler Brohltal Brenk ⓘ Schellkopf	Blass et al. (2001) +1 other reference
Burgbrohl ⓘ Herchenberg ?	Blass et al. (VI)
Glees ⓘ Gleeser Felder	Brauns +1 other reference
Spessart Hannebach ⓘ Perler Kopf ?	Hentschel (1983)
Mayen-Koblenz Mendig Mendig ⓘ In den Dellen quarries	Brauns +1 other reference
ⓘ Thelenberg	Brauns +1 other reference
Wingertsberg ⓘ Pumice quarries	Brauns +1 other reference
Pellenz Kruft ⓘ Krufter Ofen	Brauns +1 other reference
Nickenich ⓘ Nickenicher Sattel ?	Hentschel (1983)
Vordereifel Ettringen ⓘ Caspar quarry	[Blass et al. (5)
Italy
Campania Naples ⓘ Procida Island	Russo (2010)
ⓘ Somma-Vesuvius Complex	Panikorovskii et al. (2017)
ⓘ Mount Somma (TL)	NJMM (1990)
Ercolano San Vito ⓘ San Vito Quarry
Pollena Trocchia ⓘ Lagno di Pollena	Carati M.
ⓘ Pollena quarries	M. Carati - Guida alla mineralogia ...
ⓘ Mount Vesuvius	[BINON J. et al. (2004)
Terzigno ⓘ Vitiello Quarry (Cava Vitiello)	Luigi Chiappino data
Lazio Metropolitan City of Rome Capital Campagnano di Roma ⓘ Monte Cavalluccio	Liotti L. (1983)
Sacrofano ⓘ Biachella Valley	Stoppani F.S. (1982)
Viterbo Province ⓘ Bassano Romano ?	Stoppani et al. (1982)
ⓘ Vetralla
ⓘ Tre Croci	www.mindat.org (n.d.)
Viterbo ⓘ San Martino al Cimino	Fantappiè L. (1896) +2 other references
Tuscany Grosseto Province Pitigliano ⓘ Case Collina	Liotti L. (Grosseto)
Russia
Sakhalin Oblast Kuril Islands (Kurile Islands) Kurilsky District Iturup Island ⓘ Kudriavy volcano	Ganino et al. (2019)