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Masslite Quarry, Plainville, Norfolk Co., Massachusetts, USA

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 42° North , 71° West (est.)
Margin of Error:~39km
Locality type:Quarry
Köppen climate type:Dfa : Hot-summer humid continental climate


A slate and concrete aggregate quarry located about 1 1/4 mile NW of Plainville. Started about 1935. Workings were 700 feet long by 60 feet wide and 40 feet deep (or high at the face). Mostly a location for Carboniferous (Westphalian C) plant fossils and trackways. Many undetermined sulphates are found in a thick coal seam.

There are multiple levels, and the level searched is crucial as to which type of fossils will be found. The level that is at about the same elevation as the entrance contains white plant imprints on dark gray rock. These rocks are not hard to find but are definitely the minority, and are found in the rock piles leaning against the quarry wall at the opposite side of the entrance. White strip-like calamites leaves are very prevalent and are often exposed, a perfect flag for a fruitful rock worth splitting. Directly above this plant area, but at the top level, there are light gray or light brown (oxidized surface?) rocks that contain rather small footprints of reptiles and amphibians. These rocks are also in a pile leaning against the quarry wall, but unlike the plant rocks, are the only type present. Most levels, especially all those beside the top one, contain interesting quartz crystals as well as other inorganic minerals.

Plants and footprints are the most common fossils found, but insects among others have been reported. The plant fossils are especially interesting because the rock is fairly highly metamorphosed, causing the plants to be white and the rocks to often contain graphite or quartz crystals. The footprints are in more standard sedimentary rock and are often somewhat difficult to discern. One must remember that this quarry is still actively mined, so it is off limits except for Sundays and likely holidays. The walls are sheer and rocks can fall, so keep a safe distance from them.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


9 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!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

'Anthracite'
Reference: No reference listed
Calcite
Formula: CaCO3
Reference: Rocks & Min.: 21:754.; Michael W. Kieron collection
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: Michael W. Kieron collection
'Coal'
Reference: No reference listed
Graphite
Formula: C
Reference: Rocks & Min.: 21:754.
Gypsum
Formula: CaSO4 · 2H2O
Reference: P Cristofono collection
Gypsum var: Selenite
Formula: CaSO4 · 2H2O
Reference: P Cristofono collection
'Limonite'
Formula: (Fe,O,OH,H2O)
Pyrite
Formula: FeS2
Reference: Rocks & Min.: 21:754.; Michael W. Kieron collection
Quartz
Formula: SiO2
Reference: Michael W. Kieron collection
Siderite
Formula: FeCO3
Reference: Kenneth Gliesman
Sulphur ?
Formula: S8
Reference: Michael W. Kieron collection
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Reference: Michael W. Kieron collection

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Graphite'1.CB.05aC
Sulphur ?1.CC.05S8
Group 2 - Sulphides and Sulfosalts
'Pyrite'2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
'Quartz'4.DA.05SiO2
Group 5 - Nitrates and Carbonates
'Calcite'5.AB.05CaCO3
Siderite5.AB.05FeCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Gypsum'7.CD.40CaSO4 · 2H2O
var: Selenite7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
'Clinochlore'9.EC.55Mg5Al(AlSi3O10)(OH)8
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Unclassified Minerals, Rocks, etc.
'Anthracite'-
'Coal'-
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Semi-metals and non-metals
Graphite1.3.6.2C
Sulphur ?1.3.5.1S8
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Siderite14.1.1.3FeCO3
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
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 interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Anthracite'-
'Coal'-
Gypsum
var: Selenite
-CaSO4 · 2H2O
'Limonite'-(Fe,O,OH,H2O)

List of minerals for each chemical element

HHydrogen
H ClinochloreMg5Al(AlSi3O10)(OH)8
H GypsumCaSO4 · 2H2O
H Limonite(Fe,O,OH,H2O)
H Gypsum (var: Selenite)CaSO4 · 2H2O
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
CCarbon
C CalciteCaCO3
C GraphiteC
C SideriteFeCO3
OOxygen
O CalciteCaCO3
O ClinochloreMg5Al(AlSi3O10)(OH)8
O GypsumCaSO4 · 2H2O
O Limonite(Fe,O,OH,H2O)
O QuartzSiO2
O Gypsum (var: Selenite)CaSO4 · 2H2O
O SideriteFeCO3
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
MgMagnesium
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
AlAluminium
Al ClinochloreMg5Al(AlSi3O10)(OH)8
SiSilicon
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si QuartzSiO2
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
SSulfur
S GypsumCaSO4 · 2H2O
S PyriteFeS2
S Gypsum (var: Selenite)CaSO4 · 2H2O
S SulphurS8
CaCalcium
Ca CalciteCaCO3
Ca GypsumCaSO4 · 2H2O
Ca Gypsum (var: Selenite)CaSO4 · 2H2O
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
FeIron
Fe Limonite(Fe,O,OH,H2O)
Fe PyriteFeS2
Fe SideriteFeCO3

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
- Rocks & Minerals: 21: 754.


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