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Skookumchuck Dam, Bucoda, Thurston Co., Washington, USAi
Regional Level Types
Skookumchuck DamDam
Bucoda- not defined -
Thurston Co.County
WashingtonState
USACountry

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Key
08629930015031652507703.jpg
Boulders after the blast on the north side of the valley in 1969

Skookumchuck Dam, Bucoda, Thurston Co., Washington, USA
05430460015031662509616.jpg
The spillway on the south side of the valley in 1970

Skookumchuck Dam, Bucoda, Thurston Co., Washington, USA
08629930015031652507703.jpg
Boulders after the blast on the north side of the valley in 1969

Skookumchuck Dam, Bucoda, Thurston Co., Washington, USA
05430460015031662509616.jpg
The spillway on the south side of the valley in 1970

Skookumchuck Dam, Bucoda, Thurston Co., Washington, USA
04338110015031662514909.jpg
Boulders after the blast on the north side of the valley in 1969

Skookumchuck Dam, Bucoda, Thurston Co., Washington, USA
Latitude & Longitude (WGS84):
46° 47' 4'' North , 122° 43' 5'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Bucoda566 (2017)11.6km
Rainier1,985 (2017)11.7km
Tenino1,749 (2017)13.0km
Yelm8,434 (2017)19.5km
Centralia16,753 (2017)19.5km


Zeolites were found in Eocene olivine basalt flows during construction of the Skookumchuck Dam (1969-1971) near Tenino and Bucoda, Thurston County, Washington. Pockets of exceptionally large mesolite crystals were found early in the construction during blasting rock on the north side of the valley. Excellent specimens of stilbite were found later on the south side of the valley during construction of the spillway. Cavities in the basalt reached 1 meter in diameter but most were smaller. Cavities 2 to 6 cm in diameter were lined with pink to orange heulandite with a few scattered stilbite or calcite. The deep orange heulandite faded to light pink after removal from the damp rock. Several large mud-filled pockets in the spillway were only lined with drusy quartz, mordenite, and a couple small stilbite crystals. One small opening in the floor of the spillway, when fully opened, exposed a snow-white lined pocket over 2 meter in diameter, lined with white quartz-mordenite with white scattered stilbite up to 6 cm long. Later after the dam was completed, the guard at the site was float on the reservoir with a boat, found a large pocket of exception analcime in the north wall. Collecting during construction was extremely restricted to the geologist on the project, the guard at the dam, and a young geology student Rudy Tschernich. Collecting is now not allowed.

Rudy Tschernich


Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


9 valid minerals.

Detailed Mineral List:

Analcime
Formula: Na(AlSi2O6) · H2O
Habit: trapazohedra to 7cm in diameter
Colour: colorless, transparent, translucent, white
Reference: Cannon, B. (1975): Minerals of Washington, p.41; Tschernich, R. (1992): Zeolites of the World, p.71
'Apophyllite'
Habit: tetragonal bipyrmids to 1.5"
Colour: colorless to white
Reference: Cannon, B. (1975): Minerals of Washington, p.48; Tschernich, R. (1992): Zeolites of the World, 71
Calcite
Formula: CaCO3
Habit: scalenohedral crystals
Colour: yellow
Reference: Cannon, B. (1975): Minerals of Washington, p.66
'Chabazite'
Habit: crystals to 1/8"
Reference: Cannon, B. (1975): Minerals of Washington, p.70; Tschernich, R. (1992): Zeolites of the World, 71
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: Minerals of Washington, Bart Cannon, 1975
'Heulandite subgroup'
Reference: Cannon, B. (1975): Minerals of Washington, ; Tschernich, R. (1992): Zeolites of the World, 71
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Reference: Minerals of Washington, Bart Cannon, 1975
Mesolite
Formula: Na2Ca2Si9Al6O30 · 8H2O
Reference: Cannon, B. (1975): Minerals of Washington p.48; Tschernich, R. (1992): Zeolites of the World, 71
Mordenite
Formula: (Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Reference: Minerals of Washington, Bart Cannon, 1975
Okenite
Formula: Ca10Si18O46 · 18H2O
Reference: Cannon, B. (1975): Minerals of Washington, ; Tschernich, R. (1992): Zeolites of the World, 71
Quartz
Formula: SiO2
Reference: Tschernich, R. (1992): Zeolites of the World, 71
'Stilbite subgroup'
Reference: Cannon, B. (1975): Minerals of Washington, p.41,48; Tschernich, R. (1992): Zeolites of the World, p.71
Thomsonite-Ca
Formula: NaCa2[Al5Si5O20] · 6H2O
Reference: Cannon, B. (1975): Minerals of Washington, p.41; Tschernich, R. (1992): Zeolites of the World, p.71

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Analcime9.GB.05Na(AlSi2O6) · H2O
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Mesolite9.GA.05Na2Ca2Si9Al6O30 · 8H2O
Mordenite9.GD.35(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Okenite9.EA.40Ca10Si18O46 · 18H2O
Thomsonite-Ca9.GA.10NaCa2[Al5Si5O20] · 6H2O
Unclassified Minerals, Rocks, etc.
'Apophyllite'-
'Chabazite'-
'Heulandite subgroup'-
'Stilbite subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
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 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
Okenite72.3.2.5Ca10Si18O46 · 18H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Mesolite77.1.5.4Na2Ca2Si9Al6O30 · 8H2O
Mordenite77.1.6.1(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Unclassified Minerals, Mixtures, etc.
'Apophyllite'-
'Chabazite'-
'Heulandite subgroup'-
'Stilbite subgroup'-
Thomsonite-Ca-NaCa2[Al5Si5O20] · 6H2O

List of minerals for each chemical element

HHydrogen
H MesoliteNa2Ca2Si9Al6O30 · 8H2O
H AnalcimeNa(AlSi2O6) · H2O
H Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
H LaumontiteCaAl2Si4O12 · 4H2O
H Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
H ClinochloreMg5Al(AlSi3O10)(OH)8
H OkeniteCa10Si18O46 · 18H2O
CCarbon
C CalciteCaCO3
OOxygen
O QuartzSiO2
O MesoliteNa2Ca2Si9Al6O30 · 8H2O
O AnalcimeNa(AlSi2O6) · H2O
O Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
O CalciteCaCO3
O LaumontiteCaAl2Si4O12 · 4H2O
O Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
O ClinochloreMg5Al(AlSi3O10)(OH)8
O OkeniteCa10Si18O46 · 18H2O
NaSodium
Na MesoliteNa2Ca2Si9Al6O30 · 8H2O
Na AnalcimeNa(AlSi2O6) · H2O
Na Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Na Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
MgMagnesium
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
AlAluminium
Al MesoliteNa2Ca2Si9Al6O30 · 8H2O
Al AnalcimeNa(AlSi2O6) · H2O
Al Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Al LaumontiteCaAl2Si4O12 · 4H2O
Al Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Al ClinochloreMg5Al(AlSi3O10)(OH)8
SiSilicon
Si QuartzSiO2
Si MesoliteNa2Ca2Si9Al6O30 · 8H2O
Si AnalcimeNa(AlSi2O6) · H2O
Si Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Si LaumontiteCaAl2Si4O12 · 4H2O
Si Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si OkeniteCa10Si18O46 · 18H2O
KPotassium
K Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
CaCalcium
Ca MesoliteNa2Ca2Si9Al6O30 · 8H2O
Ca Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Ca CalciteCaCO3
Ca LaumontiteCaAl2Si4O12 · 4H2O
Ca Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Ca OkeniteCa10Si18O46 · 18H2O

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Tschernich, R.W. (1972) Zeolites from Skookumchuck Dam, Washington. Mineralogical Record, V 3 No., pp. 30-34.
Cannon, B. (1975) Minerals of Washington, p. 41, 48, 66, 70.
Tschernich, R.W (1992) Zeolites of the World. Geoscience Press, Phoenix Press, Arizona.

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