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Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France i
Regional Level Types
Mont Semiol Mountain
Châtelneuf Commune
Montbrison Arrondissement
Loire Department
Auvergne-Rhône-Alpes Region
France Country

Regional Level Types
Mont Semiol	Mountain
Châtelneuf	Commune
Montbrison	Arrondissement
Loire	Department
Auvergne-Rhône-Alpes	Region
France	Country

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Mont Semiol outcrop

Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France

Close-up on the Mont Semiol outcrop

Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France

Offretite

Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France

Mont Semiol outcrop

Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France

Close-up on the Mont Semiol outcrop

Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France

Offretite

Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France

Mont Semiol outcrop

Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France

Close-up on the Mont Semiol outcrop

Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France

Latitude & Longitude (WGS84):

45° 37' 57'' North , 3° 58' 10'' East

Latitude & Longitude (decimal):

G#: u04gd74ss

Type:

Köppen climate type:

Cfb : Temperate oceanic climate

Nearest Settlements:

Place	Population	Distance
Châtelneuf	270 (2016)	1.0km
Essertines-en-Châtelneuf	608 (2016)	2.5km
Roche	258 (2016)	2.6km
Lérigneux	131 (2016)	3.5km
Saint-Bonnet-le-Courreau	764 (2016)	3.7km

Mindat Locality ID:

25844

Long-form identifier:

mindat:1:2:25844:2

GUID (UUID V4):

7e7b722f-ec32-496b-a964-1ca7d35b7687

Other/historical names associated with this locality:

Mont Semiouse; Mont Simiouse

Porphyritic olivine basalt on the south slope of Mont Semiol, near the top. Located 8 km WNW of Montbrison, in the municipality of Châtelneuf.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

11 valid minerals. 2 (TL) - type locality of valid minerals. 1 erroneous literature entry.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

ⓘ 'Olivine basalt'

Detailed Mineral List:

ⓘ Augite

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

ⓘ Calcite

Formula: CaCO₃

ⓘ 'Chabazite'

ⓘ Chabazite-Na

Formula: (Na₂,K₂,Ca,Sr,Mg)₂[Al₂Si₄O₁₂]₂ · 12H₂O

ⓘ 'Erionite Subgroup'

Formula: M₂[Al₄Si₁₄O₃₆] · 15H₂O

ⓘ 'Fayalite-Forsterite Series'

ⓘ Galena

Formula: PbS

ⓘ Mazzite-Mg (TL)

Formula: (Mg,K,Ca)₅(Si₂₆Al₁₀)O₇₂ · 28H₂O

Type Locality:

References:

Valange, S., Gabelica, Z. (1996) Zeolieten. Pages 59-71 in: Schatten der Aarde. Van mineraal tot juweel. Tentoonstelling in de abdij Saint-Gérard de Brogne van 27 april tot 27 oktober 1996. Catalogus opgemaakt onder de leiding van R. Warin, AGAB en P. Van hee, MKA (in Dutch).

ⓘ ~~Mesolite~~

Formula: Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O

Description: Very likely eroneously reported, and mistaken with phillipsite. See comment by Gonnard in "Mineralogie des Departements de la Loire et du Rhone.

ⓘ Montmorillonite

Formula: (Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O

ⓘ Offretite (TL)

Formula: KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O

Type Locality:

References:

C.R.Acad.Sci.Paris,(1890) 111, 1002-1003

Betz, Volker (1982) Mont Semiol. Seltene Zeolithe aus Frankreich [Mont Semiol. Rare zeolites from France]. Lapis, 7 (12) 9-11

ⓘ Opal

Formula: SiO₂ · nH₂O

ⓘ Opal var. Opal-AN

Formula: SiO₂ · nH₂O

References:

Anthony Geneyton Collection

ⓘ 'Phillipsite Subgroup'

References:

Betz, Volker (1982) Mont Semiol. Seltene Zeolithe aus Frankreich [Mont Semiol. Rare zeolites from France]. Lapis, 7 (12) 9-11

ⓘ Quartz

Formula: SiO₂

ⓘ Quartz var. Chalcedony

Formula: SiO₂

ⓘ Siderite

Formula: FeCO₃

ⓘ Spinel

Formula: MgAl₂O₄

Gallery:

SiO₂ · nH₂Oⓘ Opal

Opal

Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France

Opal

Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France

Opal

Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Galena	2.CD.10	PbS
Group 4 - Oxides and Hydroxides
ⓘ	Spinel	4.BB.05	MgAl₂O₄
ⓘ	Quartz var. Chalcedony	4.DA.05	SiO₂
ⓘ		4.DA.05	SiO₂
ⓘ	Opal var. Opal-AN	4.DA.10	SiO₂ · nH₂O
ⓘ		4.DA.10	SiO₂ · nH₂O
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Siderite	5.AB.05	FeCO₃
Group 9 - Silicates
ⓘ	Augite	9.DA.15	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Montmorillonite	9.EC.40	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
ⓘ	Mesolite ?	9.GA.05	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
ⓘ	Mazzite-Mg (TL)	9.GC.20	(Mg,K,Ca)₅(Si₂₆Al₁₀)O₇₂ · 28H₂O
ⓘ	Chabazite-Na	9.GD.10	(Na₂,K₂,Ca,Sr,Mg)₂[Al₂Si₄O₁₂]₂ · 12H₂O
ⓘ	Offretite (TL)	9.GD.25	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Unclassified
ⓘ	'Phillipsite Subgroup'	-
ⓘ	'Erionite Subgroup'	-	M₂[Al₄Si₁₄O₃₆] · 15H₂O
ⓘ	'Chabazite'	-
ⓘ	'Fayalite-Forsterite Series'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Erionite Subgroup	M₂[Al₄Si₁₄O₃₆] · 15H₂O
H	ⓘ Opal var. Opal-AN	SiO₂ · nH₂O
H	ⓘ Mazzite-Mg	(Mg,K,Ca)₅(Si₂₆Al₁₀)O₇₂ · 28H₂O
H	ⓘ Mesolite	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
H	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
H	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
H	ⓘ Opal	SiO₂ · nH₂O
H	ⓘ Chabazite-Na	(Na₂,K₂,Ca,Sr,Mg)₂[Al₂Si₄O₁₂]₂ · 12H₂O
C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Siderite	FeCO₃
O	Oxygen
O	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Calcite	CaCO₃
O	ⓘ Quartz var. Chalcedony	SiO₂
O	ⓘ Erionite Subgroup	M₂[Al₄Si₁₄O₃₆] · 15H₂O
O	ⓘ Opal var. Opal-AN	SiO₂ · nH₂O
O	ⓘ Mazzite-Mg	(Mg,K,Ca)₅(Si₂₆Al₁₀)O₇₂ · 28H₂O
O	ⓘ Mesolite	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
O	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
O	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
O	ⓘ Opal	SiO₂ · nH₂O
O	ⓘ Quartz	SiO₂
O	ⓘ Siderite	FeCO₃
O	ⓘ Spinel	MgAl₂O₄
O	ⓘ Chabazite-Na	(Na₂,K₂,Ca,Sr,Mg)₂[Al₂Si₄O₁₂]₂ · 12H₂O
Na	Sodium
Na	ⓘ Mesolite	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
Na	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
Na	ⓘ Chabazite-Na	(Na₂,K₂,Ca,Sr,Mg)₂[Al₂Si₄O₁₂]₂ · 12H₂O
Mg	Magnesium
Mg	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Mg	ⓘ Mazzite-Mg	(Mg,K,Ca)₅(Si₂₆Al₁₀)O₇₂ · 28H₂O
Mg	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
Mg	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Mg	ⓘ Spinel	MgAl₂O₄
Mg	ⓘ Chabazite-Na	(Na₂,K₂,Ca,Sr,Mg)₂[Al₂Si₄O₁₂]₂ · 12H₂O
Al	Aluminium
Al	ⓘ Erionite Subgroup	M₂[Al₄Si₁₄O₃₆] · 15H₂O
Al	ⓘ Mazzite-Mg	(Mg,K,Ca)₅(Si₂₆Al₁₀)O₇₂ · 28H₂O
Al	ⓘ Mesolite	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
Al	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
Al	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Al	ⓘ Spinel	MgAl₂O₄
Al	ⓘ Chabazite-Na	(Na₂,K₂,Ca,Sr,Mg)₂[Al₂Si₄O₁₂]₂ · 12H₂O
Si	Silicon
Si	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Quartz var. Chalcedony	SiO₂
Si	ⓘ Erionite Subgroup	M₂[Al₄Si₁₄O₃₆] · 15H₂O
Si	ⓘ Opal var. Opal-AN	SiO₂ · nH₂O
Si	ⓘ Mazzite-Mg	(Mg,K,Ca)₅(Si₂₆Al₁₀)O₇₂ · 28H₂O
Si	ⓘ Mesolite	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
Si	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
Si	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Si	ⓘ Opal	SiO₂ · nH₂O
Si	ⓘ Quartz	SiO₂
Si	ⓘ Chabazite-Na	(Na₂,K₂,Ca,Sr,Mg)₂[Al₂Si₄O₁₂]₂ · 12H₂O
S	Sulfur
S	ⓘ Galena	PbS
K	Potassium
K	ⓘ Mazzite-Mg	(Mg,K,Ca)₅(Si₂₆Al₁₀)O₇₂ · 28H₂O
K	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
K	ⓘ Chabazite-Na	(Na₂,K₂,Ca,Sr,Mg)₂[Al₂Si₄O₁₂]₂ · 12H₂O
Ca	Calcium
Ca	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Mazzite-Mg	(Mg,K,Ca)₅(Si₂₆Al₁₀)O₇₂ · 28H₂O
Ca	ⓘ Mesolite	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
Ca	ⓘ Montmorillonite	(Na,Ca)_0.33(Al,Mg)₂(Si₄O₁₀)(OH)₂ · nH₂O
Ca	ⓘ Offretite	KCaMg(Si₁₃Al₅)O₃₆ · 15H₂O
Ca	ⓘ Chabazite-Na	(Na₂,K₂,Ca,Sr,Mg)₂[Al₂Si₄O₁₂]₂ · 12H₂O
Fe	Iron
Fe	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Siderite	FeCO₃
Sr	Strontium
Sr	ⓘ Chabazite-Na	(Na₂,K₂,Ca,Sr,Mg)₂[Al₂Si₄O₁₂]₂ · 12H₂O
Pb	Lead
Pb	ⓘ Galena	PbS

Other Regions, Features and Areas containing this locality

Eurasian PlateTectonic Plate

EuropeContinent

France

Massif CentralHighland Region

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Galli, E., Passaglia, E., Pongiluppi, D., Rinaldi, R. (1974) Mazzite, a new mineral, the natural counterpart of the synthetic zeolite Ω. Contributions to Mineralogy and Petrology: 45(2): 99-105. https://www.researchgate.net/publication/226348824_Mazzite_a_new_mineral_the_natural_counterpart_of_the_synthetic_zeolite_O

Betz, Volker (1982) Mont Semiol. Seltene Zeolithe aus Frankreich [Mont Semiol. Rare zeolites from France]. Lapis, 7 (12) 9-11

Dardillac, A., Dardillac, M. (1997) Le Mont Semiol (42). Le Cahier des Micromonteurs: 4: 5-9.

Betz, V. (2006) Mont Semiol bei Montbrison, Loire, Frankreich. Lapis: 31(11): 41-46.

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