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Durham, Lewis Co., Missouri, USA

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Latitude & Longitude (WGS84): 39° 59' North , 91° 37' West
Latitude & Longitude (decimal): 39.98333,-91.61667
GeoHash:G#: 9zng7nwzb
Köppen climate type:Dfa : Hot-summer humid continental climate


An outcrop of the geode-bearing Mississippian age Keokuk formation. Geodes at this site have been found up to 25 cm in diameter and are usually lined with colorless quartz or chalcedony, with a variety of accessory minerals.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


11 valid minerals.

Detailed Mineral List:

Aragonite
Formula: CaCO3
Reference: R&M 73:2 pp 98-117
Calcite
Formula: CaCO3
Reference: R&M 73:2 pp 98-117
Chalcopyrite
Formula: CuFeS2
Reference: R&M 73:2 pp 98-117
Goethite
Formula: α-Fe3+O(OH)
Reference: R&M 73:2 pp 98-117
Honessite
Formula: (Ni1-xFe3+x)(OH)2[SO4]x/2 · nH2O
Habit: Granular to earth aggragates replacing millerite crystals enclosed in calcite
Colour: olive green
Fluorescence: None observed
Description: Found in two geodes which consisted of thick chalcedony shells completely filled with calcite.
Reference: R&M 73:2 pp 98-117
Malachite
Formula: Cu2(CO3)(OH)2
Reference: R&M 73:2 pp 98-117
Millerite
Formula: NiS
Reference: R&M 73:2 pp 98-117
Pyrite
Formula: FeS2
Reference: R&M 73:2 pp 98-117
Quartz
Formula: SiO2
Reference: R&M 73:2 pp 98-117
Sphalerite
Formula: ZnS
Habit: Rude, often distorted tetrahedral crystals
Colour: Submetallic black
Fluorescence: None observed
Description: Usually one large single crystal, up to 4 cm on edge is found in each geode.
Reference: R&M 73:2 pp 98-117
Szomolnokite
Formula: FeSO4 · H2O
Habit: 1 to 2 mm diameter rounded crystals or cavernous elongated bipyramidal crystals
Colour: bright yellow
Description: Szomolnokite is known from this locality from one 20 cm diameter geode where it occured in shells of goethite that made up the former surface of 2 to 3 mm oxidized pyrite crystals. Szomolnokite crystals also occured on the surrounding colorless quartz crystals.
Reference: R&M 73:2 pp 98-117

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Chalcopyrite'2.CB.10aCuFeS2
'Millerite'2.CC.20NiS
'Pyrite'2.EB.05aFeS2
'Sphalerite'2.CB.05aZnS
Group 4 - Oxides and Hydroxides
'Goethite'4.00.α-Fe3+O(OH)
'Quartz'4.DA.05SiO2
Group 5 - Nitrates and Carbonates
'Aragonite'5.AB.15CaCO3
'Calcite'5.AB.05CaCO3
'Malachite'5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Honessite'7.DD.35(Ni1-xFe3+x)(OH)2[SO4]x/2 · nH2O
'Szomolnokite'7.CB.05FeSO4 · H2O

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Millerite2.8.16.1NiS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Szomolnokite29.6.2.2FeSO4 · H2O
Group 31 - HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
Miscellaneous
Honessite31.10.6.1(Ni1-xFe3+x)(OH)2[SO4]x/2 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
Aragonite-CaCO3

List of minerals for each chemical element

HHydrogen
H Goethiteα-Fe3+O(OH)
H Honessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
H MalachiteCu2(CO3)(OH)2
H SzomolnokiteFeSO4 · H2O
CCarbon
C AragoniteCaCO3
C CalciteCaCO3
C MalachiteCu2(CO3)(OH)2
OOxygen
O AragoniteCaCO3
O CalciteCaCO3
O Goethiteα-Fe3+O(OH)
O Honessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
O MalachiteCu2(CO3)(OH)2
O QuartzSiO2
O SzomolnokiteFeSO4 · H2O
SiSilicon
Si QuartzSiO2
SSulfur
S ChalcopyriteCuFeS2
S Honessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
S MilleriteNiS
S PyriteFeS2
S SphaleriteZnS
S SzomolnokiteFeSO4 · H2O
CaCalcium
Ca AragoniteCaCO3
Ca CalciteCaCO3
FeIron
Fe ChalcopyriteCuFeS2
Fe Goethiteα-Fe3+O(OH)
Fe Honessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
Fe PyriteFeS2
Fe SzomolnokiteFeSO4 · H2O
NiNickel
Ni Honessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
Ni MilleriteNiS
CuCopper
Cu ChalcopyriteCuFeS2
Cu MalachiteCu2(CO3)(OH)2
ZnZinc
Zn SphaleriteZnS

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Paleozoic
251.902 - 541 Ma



ID: 3187973
Paleozoic sedimentary rocks

Age: Phanerozoic (251.902 - 541 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Mississippian
323.2 - 358.9 Ma



ID: 2902254
Osagean Series

Age: Mississippian (323.2 - 358.9 Ma)

Stratigraphic Name: Keokuk Limestone; Burlington Limestone; Elsey Formation; Reeds Spring Formation; Pierson Limestone; Fern Glen Formation

Description: Keokuk Limestone, Burlington Limestone, Elsey Formation, Reeds Spring Formation, Pierson Limestone, Fern Glen Formation.

Comments: Keokuk Limestone- (100 ft. max) limestone with chert nodules, including Short Creek Oolite member- (8 ft. max) oolitic limestone; Burlington Limestone- (70 ft. max) white fossiliferous limestone with chert nodules; Elesey FM (or Grand Falls FM) (100 ft. max) gray limestone with chert nodules; Reeds Spring FM- (225 ft. max) alternating bands of dolomitic limestone with chert nodules; Pierson Limestone- (60 ft. max) dolomite and dolomitic limestone with chert nodules; Fern Glen FM- (45 ft. max) red limestone with some red calcareous, fossiliferous shale. The Keokuk Limestone and parts of the Reeds Springs FM are host to Mississippi Valley type Pb-Zn deposits in the Tri State District. The major commodity is zinc, from sphalerite, galena ore. IN SOUTHWEST MO-Keokuk Limestone, Burlington Limestone, Elesey FM, Reeds Spring FM, Pierson Limestone. IN CENTRAL MO- Keokuk Limestone, Burlington Limestone, Pierson Limestone. IN NORTHEAST MO- Keokuk Limestone, Burlington Limestone. IN EAST-CENTRAL MO- Keokuk Limestone, Burlington Limeston, Fern Glen FM. IN SOUTHEAST MO- Keokuk Limestone, Burlington Limeston, Fern Glen FM.

Lithology: Major:{limestone}, Minor:{chert,dolostone}, Incidental:{shale}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


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