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Rockhound Gulch (Denny Creek), Denny Mountain, King Co., Washington, USAi
Regional Level Types
Rockhound Gulch (Denny Creek)Gulch
Denny MountainMountain
King Co.County
WashingtonState
USACountry

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Much higher into the Rockhound Gulch - this is NOT an easy hike!

Rockhound Gulch, Denny Mountain, King Co., Washington, USA
Much higher into the Rockhound Gulch - this is NOT an easy hike!

Rockhound Gulch, Denny Mountain, King Co., Washington, USA
Latitude & Longitude (WGS84): 47° 25' 2'' North , 121° 26' 26'' West
Latitude & Longitude (decimal): 47.41722,-121.44056
GeoHash:G#: c23tu819m
Locality type:Gulch
Köppen climate type:Csb : Warm-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Snoqualmie Pass311 (2011)4.1km
Tanner1,018 (2011)23.9km
Riverbend2,132 (2011)23.9km
Wilderness Rim1,523 (2017)24.9km
North Bend6,679 (2017)27.4km


NOTE: This locality is now closed to collecting. Here are Bob Jackson's description of Rockhound Gulch:
""To reach Rockhound Gulch, take the Melakwa Lakes trail no. 1014. You will start on the west side of Denny Creek, cross to the east side via a large hewn log bridge, cross back to the west side where the trail descends a bank to a rock crossing. After this second crossing, the trail switchbacks up a hill, then comes back close to the creek canyon. At this point you will have a wide view of the cliffs of Low Mountain (5000') on your left. Just after you see this view, the trail turns left, and a poor trial goes off the right side down into Denny Creek canyon, across a flat rock outcrop above a waterfall, to a rocky-bottomed canyon up the side of Denny Mountain. This is Rockhound Gulch."
Bob Jackson (1974) Rockhound's Guide to Washington

References
*Cannon, B. (1975): Minerals of Washington, p.82,85

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


9 valid minerals. 1 erroneous literature entry.

Detailed Mineral List:

'Amphibole Supergroup'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Amphibole Supergroup var: Byssolite'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Calcite
Formula: CaCO3
Reference: Karl Volkman personal collection
'Chlorite Group'
Reference: Minerals of Washington, B. Cannon, 1975
Diopside
Formula: CaMgSi2O6
Habit: blocky crystals to .75 inches
Colour: greenish
Reference: Cannon, B. (1975): Minerals of Washington, p.82
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Habit: crystal sprays
Colour: dark Green
Reference: Cannon, B. (1975): Minerals of Washington, p.82,85
Goethite
Formula: α-Fe3+O(OH)
Reference: Minerals of Washington, B. Cannon, 1975
Grossular
Formula: Ca3Al2(SiO4)3
Reference: Cannon, B. (1975): Minerals of Washington, p.82
Hematite
Formula: Fe2O3
Habit: specular
Reference: Cannon, B. (1975): Minerals of Washington, p.82,85
'K Feldspar'
Reference: Cannon, B. (1975): Minerals of Washington, p.85
'K Feldspar var: Adularia'
Formula: KAlSi3O8
Reference: Cannon, B. (1975): Minerals of Washington, p.85
Lepidocrocite
Formula: γ-Fe3+O(OH)
Description: The strawberry and black inclusions in the amethyst scepters are hematite. No lepidocrocite has ever been found here.
Reference: John Lindell, Bart Cannon personal communication (RWMW)
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Minerals of Washington, B. Cannon, 1975
Quartz
Formula: SiO2
Habit: Frequent Normal Prisms some with heamtite inclusions to a few cm. Spectacular large rare Japanese Twins to over 30 cm ear to ear
Colour: colourles to red from inclusions
Fluorescence: none
Description: The normal prisms are common but not the killer twins
Reference: Cannon, B. (1975): Minerals of Washington, p.85
Quartz var: Amethyst
Formula: SiO2
Habit: doubly terminated scepters on clear quartz prisms to a few cm
Colour: strawberry purple
Description: Hematite inclusions in the Amethyst give the strawberry colour.
Reference: UBC specimen
Scheelite
Formula: Ca(WO4)
Reference: Minerals of Washington, B. Cannon, 1975

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Lepidocrocite ?4.FE.15γ-Fe3+O(OH)
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Malachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Scheelite7.GA.05Ca(WO4)
Group 9 - Silicates
Diopside9.DA.15CaMgSi2O6
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Grossular9.AD.25Ca3Al2(SiO4)3
Unclassified Minerals, Rocks, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'var: Byssolite'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Chlorite Group'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Lepidocrocite ?6.1.2.2γ-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 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Scheelite48.1.2.1Ca(WO4)
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Grossular51.4.3b.2Ca3Al2(SiO4)3
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 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'var: Byssolite'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Chlorite Group'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
Quartz
var: Amethyst
-SiO2

List of minerals for each chemical element

HHydrogen
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H MalachiteCu2(CO3)(OH)2
H Goethiteα-Fe3+O(OH)
H Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H Lepidocrociteγ-Fe3+O(OH)
CCarbon
C CalciteCaCO3
C MalachiteCu2(CO3)(OH)2
OOxygen
O Quartz (var: Amethyst)SiO2
O QuartzSiO2
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O CalciteCaCO3
O Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O GrossularCa3Al2(SiO4)3
O HematiteFe2O3
O K Feldspar (var: Adularia)KAlSi3O8
O ScheeliteCa(WO4)
O DiopsideCaMgSi2O6
O MalachiteCu2(CO3)(OH)2
O Goethiteα-Fe3+O(OH)
O Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O Lepidocrociteγ-Fe3+O(OH)
FFluorine
F Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
F Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
MgMagnesium
Mg DiopsideCaMgSi2O6
AlAluminium
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al GrossularCa3Al2(SiO4)3
Al K Feldspar (var: Adularia)KAlSi3O8
Al Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
SiSilicon
Si Quartz (var: Amethyst)SiO2
Si QuartzSiO2
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si GrossularCa3Al2(SiO4)3
Si K Feldspar (var: Adularia)KAlSi3O8
Si DiopsideCaMgSi2O6
Si Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ClChlorine
Cl Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Cl Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
K K Feldspar (var: Adularia)KAlSi3O8
CaCalcium
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca CalciteCaCO3
Ca GrossularCa3Al2(SiO4)3
Ca ScheeliteCa(WO4)
Ca DiopsideCaMgSi2O6
TiTitanium
Ti Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Ti Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
FeIron
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe HematiteFe2O3
Fe Goethiteα-Fe3+O(OH)
Fe Lepidocrociteγ-Fe3+O(OH)
CuCopper
Cu MalachiteCu2(CO3)(OH)2
WTungsten
W ScheeliteCa(WO4)

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

Quaternary
0 - 2.588 Ma



ID: 1386214
alluvium

Age: Pleistocene (0 - 2.588 Ma)

Lithology: Sand,gravel

Reference: Washington State Department of Natural Resources, Division of Geology and Earth Resources. Washington Interactive Geologic Map: 1:100,000 scale. Washington Division of Geology and Earth Resources. [19]

Rupelian - Eocene
28.1 - 56 Ma



ID: 2939930
Eocene nonmarine rocks

Age: Paleogene (28.1 - 56 Ma)

Stratigraphic Name: Manastash Formation; Naches Formation; Roslyn Formation; O'Brien Creek Formation

Description: Predominantly sandstone and shale. Includes some conglomerate in the Cle Elum area in Kittilas County. Contains extensive coal seams near Roslyn and carbonaceous shale and coal beds in White Pass area. Contains tuff beds in northwestern Ferry County.

Comments: Naches Formation is mostly basaltic and rhyolitic volcanic rock with minor andesitic rock and interbedded sedimentary rock (feldspathic sandstone) (Tabor and others, 1993, Stout, 1964). The thickness of the Naches Formation is 8000-10000+ feet thick (Stout, 1964). Original map source: Raines, Gary L., and Johnson, Bruce R., 1996, Digital representation of the Washington state geologic map; a contribution to the Interior Columbia River basin ecosystem management project, U.S. Geological Survey Open-file report 95-0684, 20 p., plus digi

Lithology: Major:{arkose}, Minor:{siltstone,basalt,rhyolite}, Incidental:{shale, conglomerate, bituminous, andesite, argillite, volcanic}

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]

Eocene
33.9 - 56 Ma



ID: 3189544
Cenozoic sedimentary rocks

Age: Eocene (33.9 - 56 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]

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


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