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Windham Co., Connecticut, USAi
Regional Level Types
Windham Co.County
ConnecticutState
USACountry

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Neighbouring regions:
Locality type:County
Largest Settlements:
PlacePopulation
Windham23,072 (2017)
Willimantic17,737 (2017)
Killingly Center17,282 (2017)
Plainfield15,498 (2017)
Thompson9,358 (2017)
Putnam7,214 (2017)


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Standard Detailed Strunz Dana Chemical Elements

Mineral List

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

29 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

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

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Alphabetical List Tree Diagram

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Albite
Formula: Na(AlSi3O8)
'Allanite Group'
Formula: {A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
Almandine
Formula: Fe2+3Al2(SiO4)3
Annite
Formula: KFe2+3(AlSi3O10)(OH)2
Beryl
Formula: Be3Al2(Si6O18)
Bismutite
Formula: (BiO)2CO3
Calcite
Formula: CaCO3
Calcite var: Ferroan Calcite
Formula: (Ca,Fe)CO3
'Chlorite Group'
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Corundum
Formula: Al2O3
Fluorite
Formula: CaF2
'Garnet Group'
Formula: X3Z2(SiO4)3
Goethite
Formula: α-Fe3+O(OH)
Graphite
Formula: C
Hematite
Formula: Fe2O3
'Hornblende'
Kaolinite
Formula: Al2(Si2O5)(OH)4
Kyanite
Formula: Al2(SiO4)O
'Limonite'
Formula: (Fe,O,OH,H2O)
Magnetite
Formula: Fe2+Fe3+2O4
Microcline
Formula: K(AlSi3O8)
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Muscovite var: Fuchsite
Formula: K(Al,Cr)3Si3O10(OH)2
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Pyrite
Formula: FeS2
Pyrrhotite
Formula: Fe7S8
Quartz
Formula: SiO2
Localities: Reported from at least 12 localities in this region.
Quartz var: Amethyst
Formula: SiO2
Quartz var: Milky Quartz
Formula: SiO2
Quartz var: Rose Quartz
Formula: SiO2
Quartz var: Smoky Quartz
Formula: SiO2
Rutile
Formula: TiO2
'Scapolite'
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Sillimanite
Formula: Al2(SiO4)O
Staurolite
Formula: Fe2+2Al9Si4O23(OH)
'Stilbite subgroup'
Titanite
Formula: CaTi(SiO4)O
Topaz ?
Formula: Al2(SiO4)(F,OH)2
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Graphite1.CB.05aC
Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Corundum4.CB.05Al2O3
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Milky Quartz4.DA.05SiO2
var: Rose Quartz4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
Bismutite5.BE.25(BiO)2CO3
Calcite5.AB.05CaCO3
var: Ferroan Calcite5.AB.05(Ca,Fe)CO3
Group 9 - Silicates
Actinolite9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Albite9.FA.35Na(AlSi3O8)
Almandine9.AD.25Fe2+3Al2(SiO4)3
Annite9.EC.20KFe2+3(AlSi3O10)(OH)2
Beryl9.CJ.05Be3Al2(Si6O18)
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Kyanite9.AF.15Al2(SiO4)O
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Fuchsite9.EC.15K(Al,Cr)3Si3O10(OH)2
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Sillimanite9.AF.05Al2(SiO4)O
Staurolite9.AF.30Fe2+2Al9Si4O23(OH)
Titanite9.AG.15CaTi(SiO4)O
Topaz ?9.AF.35Al2(SiO4)(F,OH)2
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Unclassified Minerals, Rocks, etc.
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
'Chlorite Group'-
'Garnet Group'-X3Z2(SiO4)3
'Hornblende'-
'Limonite'-(Fe,O,OH,H2O)
'Scapolite'-
'Stilbite subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Semi-metals and non-metals
Graphite1.3.6.2C
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Corundum4.3.1.1Al2O3
Hematite4.3.1.2Fe2O3
AX2
Rutile4.4.1.1TiO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Bismutite16a.3.5.1(BiO)2CO3
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Kyanite52.2.2c.1Al2(SiO4)O
Sillimanite52.2.2a.1Al2(SiO4)O
Staurolite52.2.3.1Fe2+2Al9Si4O23(OH)
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Topaz ?52.3.1.1Al2(SiO4)(F,OH)2
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Tremolite66.1.3a.1☐{Ca2}{Mg5}(Si8O22)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Annite71.2.2b.3KFe2+3(AlSi3O10)(OH)2
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Group 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
Prehnite72.1.3.1Ca2Al2Si3O10(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
Calcite
var: Ferroan Calcite
-(Ca,Fe)CO3
'Chlorite Group'-
'Garnet Group'-X3Z2(SiO4)3
'Hornblende'-
Kaolinite-Al2(Si2O5)(OH)4
'Limonite'-(Fe,O,OH,H2O)
Muscovite
var: Fuchsite
-K(Al,Cr)3Si3O10(OH)2
Quartz
var: Amethyst
-SiO2
var: Milky Quartz-SiO2
var: Rose Quartz-SiO2
var: Smoky Quartz-SiO2
'Scapolite'-
'Stilbite subgroup'-

List of minerals for each chemical element

HHydrogen
H Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
H Muscovite (var: Fuchsite)K(Al,Cr)3Si3O10(OH)2
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
H ClinochloreMg5Al(AlSi3O10)(OH)8
H PrehniteCa2Al2Si3O10(OH)2
H Limonite(Fe,O,OH,H2O)
H KaoliniteAl2(Si2O5)(OH)4
H MuscoviteKAl2(AlSi3O10)(OH)2
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H Goethiteα-Fe3+O(OH)
H AnniteKFe32+(AlSi3O10)(OH)2
H StauroliteFe22+Al9Si4O23(OH)
H TopazAl2(SiO4)(F,OH)2
BeBeryllium
Be BerylBe3Al2(Si6O18)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
CCarbon
C Calcite (var: Ferroan Calcite)(Ca,Fe)CO3
C GraphiteC
C Bismutite(BiO)2CO3
C CalciteCaCO3
OOxygen
O QuartzSiO2
O Quartz (var: Milky Quartz)SiO2
O Quartz (var: Amethyst)SiO2
O SillimaniteAl2(SiO4)O
O Quartz (var: Smoky Quartz)SiO2
O Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
O BerylBe3Al2(Si6O18)
O MagnetiteFe2+Fe23+O4
O TitaniteCaTi(SiO4)O
O CorundumAl2O3
O Calcite (var: Ferroan Calcite)(Ca,Fe)CO3
O HematiteFe2O3
O KyaniteAl2(SiO4)O
O Muscovite (var: Fuchsite)K(Al,Cr)3Si3O10(OH)2
O RutileTiO2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
O ClinochloreMg5Al(AlSi3O10)(OH)8
O PrehniteCa2Al2Si3O10(OH)2
O Limonite(Fe,O,OH,H2O)
O Bismutite(BiO)2CO3
O KaoliniteAl2(Si2O5)(OH)4
O CalciteCaCO3
O MuscoviteKAl2(AlSi3O10)(OH)2
O MicroclineK(AlSi3O8)
O AlbiteNa(AlSi3O8)
O Garnet GroupX3Z2(SiO4)3
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O Goethiteα-Fe3+O(OH)
O Quartz (var: Rose Quartz)SiO2
O AlmandineFe32+Al2(SiO4)3
O AnniteKFe32+(AlSi3O10)(OH)2
O StauroliteFe22+Al9Si4O23(OH)
O TopazAl2(SiO4)(F,OH)2
FFluorine
F FluoriteCaF2
F TopazAl2(SiO4)(F,OH)2
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
AlAluminium
Al SillimaniteAl2(SiO4)O
Al BerylBe3Al2(Si6O18)
Al CorundumAl2O3
Al KyaniteAl2(SiO4)O
Al Muscovite (var: Fuchsite)K(Al,Cr)3Si3O10(OH)2
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al PrehniteCa2Al2Si3O10(OH)2
Al KaoliniteAl2(Si2O5)(OH)4
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al MicroclineK(AlSi3O8)
Al AlbiteNa(AlSi3O8)
Al AlmandineFe32+Al2(SiO4)3
Al AnniteKFe32+(AlSi3O10)(OH)2
Al StauroliteFe22+Al9Si4O23(OH)
Al TopazAl2(SiO4)(F,OH)2
SiSilicon
Si QuartzSiO2
Si Quartz (var: Milky Quartz)SiO2
Si Quartz (var: Amethyst)SiO2
Si SillimaniteAl2(SiO4)O
Si Quartz (var: Smoky Quartz)SiO2
Si Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
Si BerylBe3Al2(Si6O18)
Si TitaniteCaTi(SiO4)O
Si KyaniteAl2(SiO4)O
Si Muscovite (var: Fuchsite)K(Al,Cr)3Si3O10(OH)2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si PrehniteCa2Al2Si3O10(OH)2
Si KaoliniteAl2(Si2O5)(OH)4
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si MicroclineK(AlSi3O8)
Si AlbiteNa(AlSi3O8)
Si Garnet GroupX3Z2(SiO4)3
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si Quartz (var: Rose Quartz)SiO2
Si AlmandineFe32+Al2(SiO4)3
Si AnniteKFe32+(AlSi3O10)(OH)2
Si StauroliteFe22+Al9Si4O23(OH)
Si TopazAl2(SiO4)(F,OH)2
SSulfur
S PyrrhotiteFe7S8
S PyriteFeS2
KPotassium
K Muscovite (var: Fuchsite)K(Al,Cr)3Si3O10(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
K MicroclineK(AlSi3O8)
K AnniteKFe32+(AlSi3O10)(OH)2
CaCalcium
Ca TitaniteCaTi(SiO4)O
Ca Calcite (var: Ferroan Calcite)(Ca,Fe)CO3
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Ca PrehniteCa2Al2Si3O10(OH)2
Ca CalciteCaCO3
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca FluoriteCaF2
TiTitanium
Ti TitaniteCaTi(SiO4)O
Ti RutileTiO2
CrChromium
Cr Muscovite (var: Fuchsite)K(Al,Cr)3Si3O10(OH)2
FeIron
Fe MagnetiteFe2+Fe23+O4
Fe PyrrhotiteFe7S8
Fe Calcite (var: Ferroan Calcite)(Ca,Fe)CO3
Fe HematiteFe2O3
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe Limonite(Fe,O,OH,H2O)
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe PyriteFeS2
Fe Goethiteα-Fe3+O(OH)
Fe AlmandineFe32+Al2(SiO4)3
Fe AnniteKFe32+(AlSi3O10)(OH)2
Fe StauroliteFe22+Al9Si4O23(OH)
BiBismuth
Bi Bismutite(BiO)2CO3

Localities in this Region
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