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Thompson, Windham County, Connecticut, USA i
Regional Level Types
Thompson Village
Windham County County
Connecticut State
USA Country

Regional Level Types
Thompson	Village
Windham County	County
Connecticut	State
USA	Country

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Stilbite-Ca

Thompson, Windham County, Connecticut, USA

Stilbite Subgroup, etc.

Thompson, Windham County, Connecticut, USA

Stilbite-Ca

Thompson, Windham County, Connecticut, USA

Stilbite Subgroup, etc.

Thompson, Windham County, Connecticut, USA

Stilbite-Ca

Thompson, Windham County, Connecticut, USA

Stilbite Subgroup, etc.

Thompson, Windham County, Connecticut, USA

Latitude & Longitude (WGS84):

41° 57' 30'' North , 71° 51' 45'' West

Latitude & Longitude (decimal):

G#: drkyswr1k

Locality type:

Köppen climate type:

Cfb : Temperate oceanic climate

Nearest Settlements:

Place	Population	Distance
Thompson	9,358 (2017)	0.0km
North Grosvenor Dale	1,530 (2017)	4.2km
Putnam	7,214 (2017)	6.1km
South Woodstock	1,291 (2017)	8.3km
Quinebaug	1,133 (2017)	10.2km

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

Club	Location	Distance
Worcester Mineral Club	Worcester, Massachusetts	34km
Rhe Island Mineral Hunters, Inc.	Warwick, Rhode Island	47km

A town located in the very northeast corner of Connecticut, it was incorporated in 1785. Geologically, the town is underlain mostly by metamorphic rocks of the Putnam-Nashoba Island Arc Terrane (Canterbury, Tatnic Hill and Quinebaug Formation gneisses), with a sliver of Avalonian Micro-continental Terrane along the east edge of town, which are separated by the Lake Chargoggagoggmanchauggagoggchaubunagungamaugg Fault.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

13 valid minerals.

Detailed Mineral List:

ⓘ Actinolite

Formula: ◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂

Habit: elongated prisms

Colour: dark green

Description: Elongated prismatic crystals to 0.5 cm in voids with stilbite, chlorite, and goethite after pyrite.

Reference: Harold Moritz collection

ⓘ Calcite

Formula: CaCO₃

Locality: West Thompson Dam, West Thompson, Thompson, Windham County, Connecticut, USA

Reference: Rocks & Minerals. Vol. 70. No. 6

ⓘ Calcite var. Iron-bearing Calcite

Formula: (Ca,Fe)CO₃

Locality: West Thompson Dam, West Thompson, Thompson, Windham County, Connecticut, USA

Reference: Rocks & Minerals. Vol. 70. No. 6

ⓘ 'Chlorite Group'

Habit: subhedral micaceous

Colour: dark green

Description: Micaceous crystals to 2mm in voids with stilbite, actinolite, and goethite after pyrite.

Reference: Harold Moritz collection

ⓘ Corundum

Formula: Al₂O₃

Locality: West Thompson Dam, West Thompson, Thompson, Windham County, Connecticut, USA

Reference: Rocks & Minerals. Vol. 70. No. 6

ⓘ Goethite

Formula: α-Fe³⁺O(OH)

Habit: cubic pseudomorphs

Colour: brown

Description: Pseudomorphs after cubic pyrite approx 1mm in voids with stilbite, chlorite, and actinolite.

Reference: Harold Moritz collection

ⓘ Hematite

Formula: Fe₂O₃

Locality: West Thompson Dam, West Thompson, Thompson, Windham County, Connecticut, USA

Reference: Rocks & Minerals. Vol. 70. No. 6

ⓘ Kyanite

Formula: Al₂(SiO₄)O

Locality: West Thompson Dam, West Thompson, Thompson, Windham County, Connecticut, USA

Reference: Rocks & Minerals. Vol. 70. No. 6

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

Locality: West Thompson Dam, West Thompson, Thompson, Windham County, Connecticut, USA

Reference: Rocks & Minerals. Vol. 70. No. 6

ⓘ Muscovite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

Locality: West Thompson Dam, West Thompson, Thompson, Windham County, Connecticut, USA

Reference: Rocks & Minerals. Vol. 70. No. 6

ⓘ Muscovite var. Fuchsite

Formula: K(Al,Cr)₃Si₃O₁₀(OH)₂

Locality: West Thompson Dam, West Thompson, Thompson, Windham County, Connecticut, USA

Reference: Rocks & Minerals. Vol. 70. No. 6

ⓘ Pyrite

Formula: FeS₂

Habit: cubic

Description: 1mm crystals pseudomorphed by goethite in voids with stilbite, chlorite, actinolite.

Reference: Harold Moritz collection

ⓘ Rutile

Formula: TiO₂

Locality: West Thompson Dam, West Thompson, Thompson, Windham County, Connecticut, USA

Reference: Rocks & Minerals. Vol. 70. No. 6

ⓘ 'Scapolite'

Locality: West Thompson Dam, West Thompson, Thompson, Windham County, Connecticut, USA

Reference: Rocks & Minerals. Vol. 70. No. 6

ⓘ Schorl

Formula: NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)

Locality: West Thompson Dam, West Thompson, Thompson, Windham County, Connecticut, USA

Reference: Rocks & Minerals. Vol. 70. No. 6

Stilbite-Ca

Thompson, Windham County, Connecticut, USA

ⓘ Stilbite-Ca

Formula: NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O

Habit: Rectangular crystals to wheat-sheaf aggregates

Colour: yellow-orange

Description: Crystal aggregates to 1 cm in voids with actinolite, chlorite and goethite after pyrite.

Reference: Harold Moritz collection

ⓘ Tremolite

Formula: ◻Ca₂Mg₅(Si₈O₂₂)(OH)₂

Locality: West Thompson Dam, West Thompson, Thompson, Windham County, Connecticut, USA

Reference: Rocks & Minerals. Vol. 70. No. 6

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Pyrite	2.EB.05a	FeS₂
Group 4 - Oxides and Hydroxides
ⓘ	Corundum	4.CB.05	Al₂O₃
ⓘ	Goethite	4.00.	α-Fe³⁺O(OH)
ⓘ	Hematite	4.CB.05	Fe₂O₃
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Rutile	4.DB.05	TiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	var. Iron-bearing Calcite	5.AB.05	(Ca,Fe)CO₃
Group 9 - Silicates
ⓘ	Actinolite	9.DE.10	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
ⓘ	Kyanite	9.AF.15	Al₂(SiO₄)O
ⓘ	Muscovite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	var. Fuchsite	9.EC.15	K(Al,Cr)₃Si₃O₁₀(OH)₂
ⓘ	Schorl	9.CK.05	NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
ⓘ	Stilbite-Ca	9.GE.10	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
ⓘ	Tremolite	9.DE.10	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
Unclassified Minerals, Rocks, etc.
ⓘ	'Chlorite Group'	-
ⓘ	'Scapolite'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Muscovite var. Fuchsite	K(Al,Cr)₃Si₃O₁₀(OH)₂
H	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
H	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Actinolite	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
H	ⓘ Goethite	α-Fe³⁺O(OH)
H	ⓘ Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
B	Boron
B	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
C	Carbon
C	ⓘ Calcite var. Iron-bearing Calcite	(Ca,Fe)CO₃
C	ⓘ Calcite	CaCO₃
O	Oxygen
O	ⓘ Corundum	Al₂O₃
O	ⓘ Calcite var. Iron-bearing Calcite	(Ca,Fe)CO₃
O	ⓘ Hematite	Fe₂O₃
O	ⓘ Kyanite	Al₂(SiO₄)O
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Muscovite var. Fuchsite	K(Al,Cr)₃Si₃O₁₀(OH)₂
O	ⓘ Rutile	TiO₂
O	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
O	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
O	ⓘ Calcite	CaCO₃
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Actinolite	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
O	ⓘ Goethite	α-Fe³⁺O(OH)
O	ⓘ Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
Na	Sodium
Na	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Na	ⓘ Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
Mg	Magnesium
Mg	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
Mg	ⓘ Actinolite	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
Al	Aluminium
Al	ⓘ Corundum	Al₂O₃
Al	ⓘ Kyanite	Al₂(SiO₄)O
Al	ⓘ Muscovite var. Fuchsite	K(Al,Cr)₃Si₃O₁₀(OH)₂
Al	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
Si	Silicon
Si	ⓘ Kyanite	Al₂(SiO₄)O
Si	ⓘ Muscovite var. Fuchsite	K(Al,Cr)₃Si₃O₁₀(OH)₂
Si	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Si	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Actinolite	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
Si	ⓘ Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
S	Sulfur
S	ⓘ Pyrite	FeS₂
K	Potassium
K	ⓘ Muscovite var. Fuchsite	K(Al,Cr)₃Si₃O₁₀(OH)₂
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Ca	Calcium
Ca	ⓘ Calcite var. Iron-bearing Calcite	(Ca,Fe)CO₃
Ca	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Actinolite	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
Ca	ⓘ Stilbite-Ca	NaCa₄(Si₂₇Al₉)O₇₂ · 28H₂O
Ti	Titanium
Ti	ⓘ Rutile	TiO₂
Cr	Chromium
Cr	ⓘ Muscovite var. Fuchsite	K(Al,Cr)₃Si₃O₁₀(OH)₂
Fe	Iron
Fe	ⓘ Calcite var. Iron-bearing Calcite	(Ca,Fe)CO₃
Fe	ⓘ Hematite	Fe₂O₃
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Schorl	NaFe₃²⁺Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Fe	ⓘ Actinolite	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
Fe	ⓘ Pyrite	FeS₂
Fe	ⓘ Goethite	α-Fe³⁺O(OH)

Localities in this Region

USA

Connecticut
- Windham County
  - Thompson
    - West Thompson
      - West Thompson Dam

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

Ganderia DomainDomain

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Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Localities in this Region

Other Regions, Features and Areas containing this locality

Thompson, Windham County, Connecticut, USA i
Regional Level Types
Thompson Village
Windham County County
Connecticut State
USA Country