Napoliite
A valid IMA mineral species
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Formula:
Pb2OFCl
Colour:
colorless
Lustre:
Adamantine
Hardness:
3
Specific Gravity:
7.797 (Calculated)
Crystal System:
Tetragonal
Name:
It is named after the city of Naples (Napoli in Italian).
Dimorph of:
Eastern rim of the “Gran Cono” crater.
Compare fiedlerite.
New structure type:
* unique order/disorder pattern of F and O atoms;
* based on litharge-type blocks alternating with Cl- layers.
Compare fiedlerite.
New structure type:
* unique order/disorder pattern of F and O atoms;
* based on litharge-type blocks alternating with Cl- layers.
Unique Identifiers
Mindat ID:
470499
Long-form identifier:
mindat:1:1:470499:3
GUID
(UUID V4):
(UUID V4):
8f0ccf36-bef8-4769-ac0a-4ce8ee9ab933
IMA Classification of Napoliite
Approved
First published:
2023
Type description reference:
Kasatkin, Anatoly V., Siidra, Oleg I., Nestola, Fabrizio, Pekov, Igor V., Agakhanov, Atali A., Koshlyakova, Natalia N., Chukanov, Nikita V., Nazarchuk, Evgeny V., Molinari, Simone, Rossi, Manuela (2023) Napoliite, Pb2OFCl, a new mineral from Vesuvius volcano, and its relationship with dimorphous rumseyite. Mineralogical Magazine, 87 (5) 711-718 doi:10.1180/mgm.2023.43
Classification of Napoliite
3.DC.
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Npi | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Napoliite
Adamantine
Transparency:
Transparent
Colour:
colorless
Streak:
white
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001}
{001}
Fracture:
Micaceous
Comment:
laminated fracture
Density:
7.797 g/cm3 (Calculated)
Optical Data of Napoliite
Type:
Uniaxial
Anisotropism:
very weakly anisotropic
Bireflectance:
none
Colour in reflected light:
grey
Internal Reflections:
none
Pleochroism:
Non-pleochroic
Comments:
The Gladstone-Dale relationship predicts an average RI of 2.10
Chemistry of Napoliite
Mindat Formula:
Pb2OFCl
Elements listed:
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| PbO | 91.71 % |
| F | 3.89 % |
| Cl | 7.34 % |
| –O=(F+Cl) | -3.30 % |
| Total: | 99.64 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | Pb1.999O0.997F0.996Cl1.007 |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Vesuvius fumaroles, Mount Vesuvius, Somma-Vesuvius Complex, Naples, Campania, Italy | via EPMA |
Crystallography of Napoliite
Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
P42/mcm
Setting:
P42/mcm
Cell Parameters:
a = 5.742(1) Å, c = 12.524(4) Å
Ratio:
a:c = 1 : 2.181
Unit Cell V:
412.92 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.860 Å | (85) |
| 3.139 Å | (20) |
| 2.914 Å | (100) |
| 2.866 Å | (63) |
| 2.118 Å | (19) |
| 2.027 Å | (19) |
| 1.665 Å | (20) |
| 1.642 Å | (23) |
Type Occurrence of Napoliite
General Appearance of Type Material:
well-shaped lamellar crystals up to 0.25 x 0.25 x 0.01 mm typically forming clusters up to 0.4 x 0.4 mm on the surface of volcanic scoria
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5885/1
Geological Setting of Type Material:
fumarole formed subsequent to the 1944 eruption of Vesuvius volcano
Associated Minerals at Type Locality:
Synonyms of Napoliite
Related Minerals - Strunz-mindat Grouping
| 3.DC. | Lucabindiite | (K,NH4)As4O6(Cl,Br) |
| 3.DC. | Torrecillasite | Na(As,Sb)3+4O6Cl |
| 3.DC. | Gajardoite | KCa0.5As3+4O6Cl2 · 5H2O |
| 3.DC. | Cuatrocapaite-(NH₄) | (NH4)3(NaMg◻)(As2O3)6Cl6 · 16H2O |
| 3.DC. | Cuatrocapaite-(K) | K3(NaMg◻)(As2O3)6Cl6 · 16H2O |
| 3.DC.05 | Laurionite | PbCl(OH) |
| 3.DC.05 | Paralaurionite | PbCl(OH) |
| 3.DC.05 | Russoite | (NH4)ClAs2O3(H2O)0.5 |
| 3.DC.05 | Mauriziodiniite | (NH4)(As2O3)2I |
| 3.DC.10 | Fiedlerite | Pb3FCl4(OH) · H2O |
| 3.DC.15 | Penfieldite | Pb2Cl3(OH) |
| 3.DC.15 | Telluroperite | Pb3TeO4Cl2 |
| 3.DC.20 | Laurelite | Pb7F12Cl2 |
| 3.DC.25 | Bismoclite | BiOCl |
| 3.DC.25 | Matlockite | PbFCl |
| 3.DC.25 | Rorisite | CaFCl |
| 3.DC.25 | Zavaritskite | (BiO)F |
| 3.DC.25 | Zhangpeishanite | BaFCl |
| 3.DC.30 | Nadorite | PbSbClO2 |
| 3.DC.30 | Perite | PbBiClO2 |
| 3.DC.40 | Thorikosite | Pb3Cl2(OH)(SbO3,AsO3) |
| 3.DC.45 | Mereheadite | Pb47Cl25(OH)13O24(CO3)(BO3)2 |
| 3.DC.50 | Blixite | Pb8O5(OH)2Cl4 |
| 3.DC.52 | Rumseyite | Pb2OClF |
| 3.DC.55 | Pinalite | Pb3WO5Cl2 |
| 3.DC.55 | Vladkrivovichevite | [Pb32O18][Pb4Mn2O]Cl14(BO3)8 · 2H2O |
| 3.DC.57 | Yeomanite | Pb2O(OH)Cl |
| 3.DC.60 | Lorettoite | Pb7O6Cl2 |
| 3.DC.60 | Symesite | Pb10(SO4)O7Cl4 · H2O |
| 3.DC.62 | Sarawakite (of Frenzel) | Sb, O, Cl (?) |
| 3.DC.65 | Ecdemite | Pb6Cl4(As2O7) |
| 3.DC.70 | Mendipite | Pb3Cl2O2 |
| 3.DC.75 | Damaraite | Pb3Cl(OH)O2 |
| 3.DC.80 | Onoratoite | Sb8Cl2O11 |
| 3.DC.95 | Barstowite | Pb4Cl6(CO3) · H2O |
Fluorescence of Napoliite
none
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Napoliite
mindat.org URL:
https://www.mindat.org/min-470499.html
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References for Napoliite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2022) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 70. European Journal of Mineralogy, 34 (6) 591-601 doi:10.5194/ejm-34-591-2022
Kasatkin, Anatoly V., Siidra, Oleg I., Nestola, Fabrizio, Pekov, Igor V., Agakhanov, Atali A., Koshlyakova, Natalia N., Chukanov, Nikita V., Nazarchuk, Evgeny V., Molinari, Simone, Rossi, Manuela (2023) Napoliite, Pb2OFCl, a new mineral from Vesuvius volcano, and its relationship with dimorphous rumseyite. Mineralogical Magazine, 87 (5) 711-718 doi:10.1180/mgm.2023.43
Localities for Napoliite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
| Miyawaki et al. (2022) +1 other reference |
