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Matlock drill core, Sioux Co., Iowa, USAi
Regional Level Types
Matlock drill core- not defined -
Sioux Co.County
IowaState
USACountry

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Key
Latitude & Longitude (WGS84):
43° 14' 37'' North , 95° 56' 6'' West
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
Boyden708 (2017)8.2km
Sheldon5,088 (2017)9.4km
George1,055 (2017)12.4km
Ashton430 (2017)13.9km
Hull2,244 (2017)17.2km


Iowaite was found in a diamond drill core in serpentinite, at a depth of 1000-1500 feet. In late 1963, New Jersey Zinc drilled a series of exploration drill cores on an aeromagnetic anomaly in Sioux and Lyon counties in northwest Iowa. Later study of these cores revealed an altered Archean age layered mafic pluton that included a serpentinized zone with centimeter-thick chromite bands. Otter Creek layered igneous complex near the town of Matlock.

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Standard Detailed Strunz Dana Chemical Elements

Mineral List


19 valid minerals. 1 (TL) - type locality of 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:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
Albite
Formula: Na(AlSi3O8)
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
'Amphibole Supergroup'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
Brucite
Formula: Mg(OH)2
Reference: American Mineralogist: 52: 1261-1271.
Calcite
Formula: CaCO3
Reference: American Mineralogist: 52: 1261-1271.; Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
'Chlorite Group'
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
Chromite
Formula: Fe2+Cr3+2O4
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
Chrysotile
Formula: Mg3(Si2O5)(OH)4
Reference: American Mineralogist: 52: 1261-1271.
Cummingtonite
Formula: ☐{Mg2}{Mg5}(Si8O22)(OH)2
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
Dolomite
Formula: CaMg(CO3)2
Reference: American Mineralogist: 52: 1261-1271.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
Ferro-actinolite
Formula: ☐{Ca2}{Fe2+5}(Si8O22)(OH)2
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
Grunerite
Formula: ☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
Iowaite (TL)
Formula: Mg6Fe3+2(OH)16Cl2 · 4H2O
Type Locality:
Reference: American Mineralogist: 52: 1261-1271.
Magnesite
Formula: MgCO3
Reference: American Mineralogist: 52: 1261-1271.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
Pyrite
Formula: FeS2
Reference: American Mineralogist: 52: 1261-1271.
Pyroaurite
Formula: Mg6Fe3+2(OH)16[CO3] · 4H2O
Reference: American Mineralogist: 52: 1261-1271.
Quartz
Formula: SiO2
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.
Talc
Formula: Mg3Si4O10(OH)2
Reference: Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Brucite4.FE.05Mg(OH)2
Chromite4.BB.05Fe2+Cr3+2O4
Iowaite (TL)4.FL.05Mg6Fe3+2(OH)16Cl2 · 4H2O
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Dolomite5.AB.10CaMg(CO3)2
Magnesite5.AB.05MgCO3
Pyroaurite5.DA.50Mg6Fe3+2(OH)16[CO3] · 4H2O
Group 9 - Silicates
Actinolite9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Albite9.FA.35Na(AlSi3O8)
Chrysotile9.ED.15Mg3(Si2O5)(OH)4
Cummingtonite9.DE.05☐{Mg2}{Mg5}(Si8O22)(OH)2
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ferro-actinolite9.DE.10☐{Ca2}{Fe2+5}(Si8O22)(OH)2
Grunerite9.DE.05☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Talc9.EC.05Mg3Si4O10(OH)2
Unclassified Minerals, Rocks, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Chlorite Group'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
X(OH)2
Brucite6.2.1.1Mg(OH)2
Miscellaneous
Iowaite (TL)6.4.5.1Mg6Fe3+2(OH)16Cl2 · 4H2O
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Magnesite14.1.1.2MgCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 16b - HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
Pyroaurite16b.6.2.3Mg6Fe3+2(OH)16[CO3] · 4H2O
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)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Cummingtonite66.1.1.1☐{Mg2}{Mg5}(Si8O22)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Chrysotile71.1.5.1Mg3(Si2O5)(OH)4
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Talc71.2.1.3Mg3Si4O10(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)
Unclassified Minerals, Mixtures, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Chlorite Group'-
Ferro-actinolite-☐{Ca2}{Fe2+5}(Si8O22)(OH)2
Grunerite-☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H IowaiteMg6Fe23+(OH)16Cl2 · 4H2O
H ChrysotileMg3(Si2O5)(OH)4
H BruciteMg(OH)2
H PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
H Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
H TalcMg3Si4O10(OH)2
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
H Ferro-actinolite☐{Ca2}{Fe52+}(Si8O22)(OH)2
H Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
CCarbon
C DolomiteCaMg(CO3)2
C CalciteCaCO3
C MagnesiteMgCO3
C PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
OOxygen
O IowaiteMg6Fe23+(OH)16Cl2 · 4H2O
O ChrysotileMg3(Si2O5)(OH)4
O DolomiteCaMg(CO3)2
O BruciteMg(OH)2
O CalciteCaCO3
O MagnesiteMgCO3
O PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
O AlbiteNa(AlSi3O8)
O Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O MagnetiteFe2+Fe23+O4
O QuartzSiO2
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
O TalcMg3Si4O10(OH)2
O ChromiteFe2+Cr23+O4
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
O Ferro-actinolite☐{Ca2}{Fe52+}(Si8O22)(OH)2
O Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
O MuscoviteKAl2(AlSi3O10)(OH)2
FFluorine
F Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
NaSodium
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg IowaiteMg6Fe23+(OH)16Cl2 · 4H2O
Mg ChrysotileMg3(Si2O5)(OH)4
Mg DolomiteCaMg(CO3)2
Mg BruciteMg(OH)2
Mg MagnesiteMgCO3
Mg PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Mg TalcMg3Si4O10(OH)2
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Mg Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
Mg Ferro-actinolite☐{Ca2}{Fe52+}(Si8O22)(OH)2
AlAluminium
Al AlbiteNa(AlSi3O8)
Al Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si ChrysotileMg3(Si2O5)(OH)4
Si AlbiteNa(AlSi3O8)
Si Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si QuartzSiO2
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Si TalcMg3Si4O10(OH)2
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
Si Ferro-actinolite☐{Ca2}{Fe52+}(Si8O22)(OH)2
Si Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
SSulfur
S PyriteFeS2
ClChlorine
Cl IowaiteMg6Fe23+(OH)16Cl2 · 4H2O
Cl Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca DolomiteCaMg(CO3)2
Ca CalciteCaCO3
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca Ferro-actinolite☐{Ca2}{Fe52+}(Si8O22)(OH)2
TiTitanium
Ti Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
CrChromium
Cr ChromiteFe2+Cr23+O4
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe IowaiteMg6Fe23+(OH)16Cl2 · 4H2O
Fe PyriteFeS2
Fe PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe MagnetiteFe2+Fe23+O4
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Fe ChromiteFe2+Cr23+O4
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe Ferro-actinolite☐{Ca2}{Fe52+}(Si8O22)(OH)2
Fe Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Kohls, D. & J. Rodda (1967) Iowaite, a new hydrous magnesium hydroxide - ferric oxychloride from the Precambrian of Iowa: American Mineralogist: 52 (9-10): 1261-1271.
Van Schmus, W. R., & Wallin, E. T. (1991). Studies of the Precambrian Geology of Iowa: Part 3. Geochronologic data for the Matlock drill holes. Journal of the Iowa Academy of Science: JIAS, 98(4), 182-188.
Windom, K. E., Schmus, W. R. V., Seifert, K. E., Wallin, E. T., & Anderson, R. R. (1993). Archean and Proterozoic tectono-magmatic activity along the southern margin of the Superior Province in northwestern Iowa, United States. Canadian Journal of Earth Sciences, 30(6), 1275-1285.
Windom, K. E., Seifert, K. E., & Anderson, R. R. (1991). Studies of the Precambrian geology of Iowa: Part 1. The Otter Creek layered igneous complex. Journal of the Iowa Academy of Science: JIAS, 98(4), 170-177.

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