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Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada i
Regional Level Types
Km 21 North on-ramp Road Cutting
Autoroute 5 roadcuts Group of Road Cuttings
Autoroute 5 extension Road
Autoroute 5 Road
Chelsea Municipality
Les Collines-de-l'Outaouais RCM Regional County Municipality
Outaouais Administrative Region
Québec Province
Canada Country

Regional Level Types
Km 21 North on-ramp	Road Cutting
Autoroute 5 roadcuts	Group of Road Cuttings
Autoroute 5 extension	Road
Autoroute 5	Road
Chelsea	Municipality
Les Collines-de-l'Outaouais RCM	Regional County Municipality
Outaouais	Administrative Region
Québec	Province
Canada	Country

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Limonite pockets

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Fluorite occurrence on Highway 5

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Fluorite occurrence - a closer view

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Limonite pockets

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Fluorite occurrence on Highway 5

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Fluorite occurrence - a closer view

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Limonite pockets

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Fluorite occurrence on Highway 5

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Latitude & Longitude (WGS84):

45° 34' 24'' North , 75° 52' 26'' West

Latitude & Longitude (decimal):

45.57361,-75.87389

GRN:

N31W39

Type:

Road Cutting - last checked 2025

Köppen climate type:

Dfb : Warm-summer humid continental climate

Nearest Settlements:

Place	Population	Distance
Cantley	10,412 (2018)	7.1km
Wakefield	2,000 (2016)	10.8km
le Plateau	15,000 (2015)	17.0km
Gatineau	242,124 (2016)	17.2km
Val-des-Monts	9,539 (2016)	18.3km

Nearest Clubs:
Local clubs are the best way to get access to collecting localities

Club	Location	Distance
Eastern Ontario Natural History Society (EONS) / Ottawa Paleontology Club	Ottawa, Ontario	22km
Ottawa Lapsmith and Mineral Club	Ottawa, Ontario	22km

Mindat Locality ID:

450458

Long-form identifier:

mindat:1:2:450458:3

GUID (UUID V4):

The km 21 on-ramp north is on the eastern side of the highway. It comes onto the highway at the 8+700 N mark (where the molybdenite occurrence is). It was the most prolific producer in terms of variety of species, and specimens were found along the entire length of the onramp. The exposed road cuts on either side had a varied geology. For example, the entrance area consists of aplite. Along the way there are various meta-igneous occurrences with crustal carbonatites filling fissures in the rock. One of these carbonatite dykes was cut by hydrothermal alterations leading to a wide variety of minerals. The area has been largely worked over.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

16 valid minerals.

Detailed Mineral List:

ⓘ Albite

Formula: Na(AlSi₃O₈)

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ 'Betafite Group'

Formula: A₂(Ti,Nb)₂O₆Z

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: SEM-EDS

ⓘ Calcite

Formula: CaCO₃

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ 'Chlorite Group'

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ Clinozoisite

Formula: (CaCa)(AlAlAl)O[Si₂O₇][SiO₄](OH)

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ Corrensite

Formula: (Mg,Fe)₉((Si,Al)₈O₂₀)(OH)₁₀ · nH₂O

References:

Geological Survey of CanadaIdentification: XRD

ⓘ Fluorapatite

Formula: Ca₅(PO₄)₃F

References:

Jeffrey de Fourestier collectionIdentification: SEM-EDS

ⓘ Fluorite

Formula: CaF₂

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ Hematite

Formula: Fe₂O₃

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ Marcasite

Formula: FeS₂

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ Microcline

Formula: K(AlSi₃O₈)

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ Pyrite

Formula: FeS₂

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ 'Pyrochlore Group'

Formula: A₂Nb₂(O,OH)₆Z

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ 'Pyrochlore Supergroup'

Formula: A_2-mD₂X_6-wZ_1-n

References:

Jeffrey de Fourestier collectionIdentification: SEM-EDS

ⓘ Pyrrhotite

Formula: Fe_1-xS

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification, Inferred (explain how)

ⓘ Quartz

Formula: SiO₂

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ Quartz var. Smoky Quartz

Formula: SiO₂

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ Richterite

Formula: Na(NaCa)Mg₅(Si₈O₂₂)(OH)₂

References:

Jeffrey de Fourestier collectionIdentification: SEM-EDS

ⓘ 'Serpentine Subgroup'

Formula: D₃[Si₂O₅](OH)₄

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ Sphalerite

Formula: ZnS

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ Titanite

Formula: CaTi(SiO₄)O

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

ⓘ Zircon

Formula: Zr(SiO₄)

References:

Jeffrey de Fourestier collectionIdentified by Jeffrey de Fourestier: Visual Identification

Gallery:

CaCO₃ⓘ Calcite

Calcite, etc.

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Calcite, etc.

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Calcite, etc.

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

K(AlSi₃O₈)ⓘ Microcline

Microcline

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Microcline

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Microcline

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Microcline

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Microcline

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Microcline

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

SiO₂ⓘ Quartz

Quartz, etc.

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Quartz, etc.

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Quartz, etc.

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Quartz, etc.

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Quartz, etc.

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Quartz, etc.

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Quartz, etc.

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Quartz, etc.

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

SiO₂ⓘ Quartz var. Smoky Quartz

Smoky Quartz

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Smoky Quartz

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

Smoky Quartz

Km 21 North on-ramp, Autoroute 5 roadcuts, Autoroute 5 extension, Autoroute 5, Chelsea, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Sphalerite	2.CB.05a	ZnS
ⓘ	Pyrrhotite	2.CC.10	Fe_1-xS
ⓘ	Pyrite	2.EB.05a	FeS₂
ⓘ	Marcasite	2.EB.10a	FeS₂
Group 3 - Halides
ⓘ	Fluorite	3.AB.25	CaF₂
Group 4 - Oxides and Hydroxides
ⓘ	'Pyrochlore Group'	4.00.	A₂Nb₂(O,OH)₆Z
ⓘ	Hematite	4.CB.05	Fe₂O₃
ⓘ	Quartz	4.DA.05	SiO₂
ⓘ	var. Smoky Quartz	4.DA.05	SiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
Group 8 - Phosphates, Arsenates and Vanadates
ⓘ	Fluorapatite	8.BN.05	Ca₅(PO₄)₃F
Group 9 - Silicates
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Titanite	9.AG.15	CaTi(SiO₄)O
ⓘ	Clinozoisite	9.BG.05a	(CaCa)(AlAlAl)O[Si₂O₇][SiO₄](OH)
ⓘ	Richterite	9.DE.20	Na(NaCa)Mg₅(Si₈O₂₂)(OH)₂
ⓘ	Corrensite	9.EC.60	(Mg,Fe)₉((Si,Al)₈O₂₀)(OH)₁₀ · nH₂O
ⓘ	Microcline	9.FA.30	K(AlSi₃O₈)
ⓘ	Albite	9.FA.35	Na(AlSi₃O₈)
Unclassified
ⓘ	'Chlorite Group'	-
ⓘ	'Serpentine Subgroup'	-	D₃[Si₂O₅](OH)₄
ⓘ	'Pyrochlore Supergroup'	-	A_2-mD₂X_6-wZ_1-n
ⓘ	'Betafite Group'	-	A₂(Ti,Nb)₂O₆Z

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Clinozoisite	(CaCa)(AlAlAl)O[Si₂O₇][SiO₄](OH)
H	ⓘ Corrensite	(Mg,Fe)₉((Si,Al)₈O₂₀)(OH)₁₀ · nH₂O
H	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
H	ⓘ Richterite	Na(NaCa)Mg₅(Si₈O₂₂)(OH)₂
H	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
C	Carbon
C	ⓘ Calcite	CaCO₃
O	Oxygen
O	ⓘ Albite	Na(AlSi₃O₈)
O	ⓘ Calcite	CaCO₃
O	ⓘ Clinozoisite	(CaCa)(AlAlAl)O[Si₂O₇][SiO₄](OH)
O	ⓘ Corrensite	(Mg,Fe)₉((Si,Al)₈O₂₀)(OH)₁₀ · nH₂O
O	ⓘ Fluorapatite	Ca₅(PO₄)₃F
O	ⓘ Hematite	Fe₂O₃
O	ⓘ Microcline	K(AlSi₃O₈)
O	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
O	ⓘ Quartz	SiO₂
O	ⓘ Richterite	Na(NaCa)Mg₅(Si₈O₂₂)(OH)₂
O	ⓘ Quartz var. Smoky Quartz	SiO₂
O	ⓘ Titanite	CaTi(SiO₄)O
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
O	ⓘ Betafite Group	A₂(Ti,Nb)₂O₆Z
F	Fluorine
F	ⓘ Fluorapatite	Ca₅(PO₄)₃F
F	ⓘ Fluorite	CaF₂
Na	Sodium
Na	ⓘ Albite	Na(AlSi₃O₈)
Na	ⓘ Richterite	Na(NaCa)Mg₅(Si₈O₂₂)(OH)₂
Mg	Magnesium
Mg	ⓘ Corrensite	(Mg,Fe)₉((Si,Al)₈O₂₀)(OH)₁₀ · nH₂O
Mg	ⓘ Richterite	Na(NaCa)Mg₅(Si₈O₂₂)(OH)₂
Al	Aluminium
Al	ⓘ Albite	Na(AlSi₃O₈)
Al	ⓘ Clinozoisite	(CaCa)(AlAlAl)O[Si₂O₇][SiO₄](OH)
Al	ⓘ Corrensite	(Mg,Fe)₉((Si,Al)₈O₂₀)(OH)₁₀ · nH₂O
Al	ⓘ Microcline	K(AlSi₃O₈)
Si	Silicon
Si	ⓘ Albite	Na(AlSi₃O₈)
Si	ⓘ Clinozoisite	(CaCa)(AlAlAl)O[Si₂O₇][SiO₄](OH)
Si	ⓘ Corrensite	(Mg,Fe)₉((Si,Al)₈O₂₀)(OH)₁₀ · nH₂O
Si	ⓘ Microcline	K(AlSi₃O₈)
Si	ⓘ Quartz	SiO₂
Si	ⓘ Richterite	Na(NaCa)Mg₅(Si₈O₂₂)(OH)₂
Si	ⓘ Quartz var. Smoky Quartz	SiO₂
Si	ⓘ Titanite	CaTi(SiO₄)O
Si	ⓘ Zircon	Zr(SiO₄)
Si	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
P	Phosphorus
P	ⓘ Fluorapatite	Ca₅(PO₄)₃F
S	Sulfur
S	ⓘ Marcasite	FeS₂
S	ⓘ Pyrite	FeS₂
S	ⓘ Pyrrhotite	Fe_1-xS
S	ⓘ Sphalerite	ZnS
K	Potassium
K	ⓘ Microcline	K(AlSi₃O₈)
Ca	Calcium
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Clinozoisite	(CaCa)(AlAlAl)O[Si₂O₇][SiO₄](OH)
Ca	ⓘ Fluorapatite	Ca₅(PO₄)₃F
Ca	ⓘ Fluorite	CaF₂
Ca	ⓘ Richterite	Na(NaCa)Mg₅(Si₈O₂₂)(OH)₂
Ca	ⓘ Titanite	CaTi(SiO₄)O
Ti	Titanium
Ti	ⓘ Titanite	CaTi(SiO₄)O
Ti	ⓘ Betafite Group	A₂(Ti,Nb)₂O₆Z
Fe	Iron
Fe	ⓘ Corrensite	(Mg,Fe)₉((Si,Al)₈O₂₀)(OH)₁₀ · nH₂O
Fe	ⓘ Hematite	Fe₂O₃
Fe	ⓘ Marcasite	FeS₂
Fe	ⓘ Pyrite	FeS₂
Fe	ⓘ Pyrrhotite	Fe_1-xS
Zn	Zinc
Zn	ⓘ Sphalerite	ZnS
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)
Nb	Niobium
Nb	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
Nb	ⓘ Betafite Group	A₂(Ti,Nb)₂O₆Z

Other Regions, Features and Areas containing this locality

North AmericaContinent

North America PlateTectonic Plate

Grenville OrogenyOrogenic Belt

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