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 Gallery Strunz 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

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.p.41

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ 'Apophyllite Group'

Formula: AB₄[Si₈O₂₂]X · 8H₂O

Habit: tetragonal bipyrmids to 1.5"

Colour: colorless to white

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.p.48

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ Calcite

Formula: CaCO₃

Habit: scalenohedral crystals

Colour: yellow

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.p.66

ⓘ 'Chabazite'

Habit: crystals to 1/8"

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.p.70

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ Clinochlore

Formula: Mg₅Al(AlSi₃O₁₀)(OH)₈

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.

ⓘ 'Heulandite Subgroup'

Formula: (Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ Laumontite

Formula: CaAl₂Si₄O₁₂ · 4H₂O

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.

ⓘ Mesolite

Formula: Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.p.48

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ Mordenite

Formula: (Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆ · 28H₂O

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.

ⓘ Okenite

Formula: Ca₁₀Si₁₈O₄₆ · 18H₂O

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ Quartz

Formula: SiO₂

References:

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ 'Stilbite Subgroup'

Formula: M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.pages 41,48

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

ⓘ Thomsonite-Ca

Formula: NaCa₂[Al₅Si₅O₂₀] · 6H₂O

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.p.41

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

Gallery:

Na(AlSi₂O₆) · H₂Oⓘ Analcime

AB₄[Si₈O₂₂]X · 8H₂Oⓘ 'Apophyllite Group'

CaCO₃ⓘ Calcite

(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂Oⓘ 'Heulandite Subgroup'

Na₂Ca₂Si₉Al₆O₃₀ · 8H₂Oⓘ Mesolite

(Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆ · 28H₂Oⓘ Mordenite

Ca₁₀Si₁₈O₄₆ · 18H₂Oⓘ Okenite

SiO₂ⓘ Quartz

M_6-7[Al_8-9Si_27-28O₇₂] · nH₂Oⓘ 'Stilbite Subgroup'

NaCa₂[Al₅Si₅O₂₀] · 6H₂Oⓘ Thomsonite-Ca

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Quartz	4.DA.05	SiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
Group 9 - Silicates
ⓘ	Okenite	9.EA.40	Ca₁₀Si₁₈O₄₆ · 18H₂O
ⓘ	Clinochlore	9.EC.55	Mg₅Al(AlSi₃O₁₀)(OH)₈
ⓘ	Mesolite	9.GA.05	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
ⓘ	Thomsonite-Ca	9.GA.10	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
ⓘ	Analcime	9.GB.05	Na(AlSi₂O₆) · H₂O
ⓘ	Laumontite	9.GB.10	CaAl₂Si₄O₁₂ · 4H₂O
ⓘ	Mordenite	9.GD.35	(Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆ · 28H₂O
Unclassified
ⓘ	'Apophyllite Group'	-	AB₄[Si₈O₂₂]X · 8H₂O
ⓘ	'Chabazite'	-
ⓘ	'Heulandite Subgroup'	-	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
ⓘ	'Stilbite Subgroup'	-	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
H	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
H	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
H	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
H	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
H	ⓘ Mesolite	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
H	ⓘ Mordenite	(Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆ · 28H₂O
H	ⓘ Okenite	Ca₁₀Si₁₈O₄₆ · 18H₂O
H	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
H	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
C	Carbon
C	ⓘ Calcite	CaCO₃
O	Oxygen
O	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
O	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
O	ⓘ Calcite	CaCO₃
O	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
O	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
O	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
O	ⓘ Mesolite	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
O	ⓘ Mordenite	(Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆ · 28H₂O
O	ⓘ Okenite	Ca₁₀Si₁₈O₄₆ · 18H₂O
O	ⓘ Quartz	SiO₂
O	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
O	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Na	Sodium
Na	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Na	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Na	ⓘ Mesolite	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
Na	ⓘ Mordenite	(Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆ · 28H₂O
Na	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Mg	Magnesium
Mg	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
Al	Aluminium
Al	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Al	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
Al	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Al	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
Al	ⓘ Mesolite	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
Al	ⓘ Mordenite	(Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆ · 28H₂O
Al	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Al	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Si	Silicon
Si	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Si	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
Si	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
Si	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Si	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
Si	ⓘ Mesolite	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
Si	ⓘ Mordenite	(Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆ · 28H₂O
Si	ⓘ Okenite	Ca₁₀Si₁₈O₄₆ · 18H₂O
Si	ⓘ Quartz	SiO₂
Si	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Si	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
K	Potassium
K	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
K	ⓘ Mordenite	(Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆ · 28H₂O
Ca	Calcium
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Ca	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
Ca	ⓘ Mesolite	Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O
Ca	ⓘ Mordenite	(Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆ · 28H₂O
Ca	ⓘ Okenite	Ca₁₀Si₁₈O₄₆ · 18H₂O
Ca	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O

Other Regions, Features and Areas containing this locality

North America

Cascade RangeMountain Range

North America PlateTectonic Plate

Siletzia DomainDomain
Western Washington–Oregon BasinsBasin

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References

Tschernich, R.W. (1972) Zeolites from Skookumchuck Dam, Washington. Mineralogical Record, V 3 No., pp. 30-34.

Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.pages 41, 48, 66, 70

Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.

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Skookumchuck Dam, Bucoda, Thurston County, Washington, USAiRegional Level TypesSkookumchuck DamDam Bucoda- not defined - Thurston CountyCounty WashingtonState USACountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

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Skookumchuck Dam, Bucoda, Thurston County, Washington, USA i
Regional Level Types
Skookumchuck Dam Dam
Bucoda - not defined -
Thurston County County
Washington State
USA Country