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Coney Island, Salem, Essex Co., Massachusetts, USAi
Regional Level Types
Coney IslandIsland
Salem- not defined -
Essex Co.County

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Latitude & Longitude (WGS84): 42° 31' 43'' North , 70° 50' 12'' West
Latitude & Longitude (decimal): 42.52861,-70.83667
GeoHash:G#: drt9un474
Locality type:Island
Köppen climate type:Dfb : Warm-summer humid continental climate

An island in Salem Sound. The report of arfvedsonite needs validation. Authors such as Warren and Palache (1911) through Lyons (1976) published chemical analyses showing that Massachusetts "arfvedsonite-riebeckite" series amphiboles should be simply labeled "riebeckite".

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

7 valid minerals.

Detailed Mineral List:

Formula: Na(AlSi3O8)
Arfvedsonite ?
Formula: [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Description: The presence of such a sodic amphibole in this rock is unproven. (Original reference cited is a secondary source and known for uncritical listings.)
Reference: Gleba (1978) Minerals of Massachusetts
Reference: Sears, JH, 1905, Geology of Essex County, Mass.
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Sears, JH, 1905, Geology of Essex County, Mass.
'Feldspar Group'
'Feldspar Group var: Perthite'
Formula: K(AlSi3O8)
Reference: Sears, JH, 1905, Geology of Essex County, Mass.
Formula: K(AlSi3O8)
Formula: K(AlSi3O8)
Formula: Zr(SiO4)

List of minerals arranged by Strunz 10th Edition classification

Group 9 - Silicates
Arfvedsonite ?9.DE.25[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Unclassified Minerals, Rocks, etc.
'Feldspar Group'-
'var: Perthite'-

List of minerals arranged by Dana 8th Edition classification

Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Unclassified Minerals, Mixtures, etc.
Arfvedsonite ?-[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
'Feldspar Group'-
'var: Perthite'-

List of minerals for each chemical element

H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
O ZirconZr(SiO4)
O AlbiteNa(AlSi3O8)
O OrthoclaseK(AlSi3O8)
O SanidineK(AlSi3O8)
O MicroclineK(AlSi3O8)
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Na AlbiteNa(AlSi3O8)
Na Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Al AlbiteNa(AlSi3O8)
Al OrthoclaseK(AlSi3O8)
Al SanidineK(AlSi3O8)
Al MicroclineK(AlSi3O8)
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si ZirconZr(SiO4)
Si AlbiteNa(AlSi3O8)
Si OrthoclaseK(AlSi3O8)
Si SanidineK(AlSi3O8)
Si MicroclineK(AlSi3O8)
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
K OrthoclaseK(AlSi3O8)
K SanidineK(AlSi3O8)
K MicroclineK(AlSi3O8)
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Zr ZirconZr(SiO4)

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