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Jarrod Dall's Photo Gallery

Vog in shoshonite porphyry boulder at base of cliffs

Southeast Quarry, North Table Mountain, Golden, Golden Mining District, Jefferson Co., Colorado, USA

Specimen collected at North Table Mountain, a mesa just west of Denver, Colorado, characterized by its basaltic cap rock formed from tertiary lava flows. Four distinct levels of shoshonite porphyry lava flows are distributed throughout the mesa resting upon and between upper layers of Denver Formation sedimentary rock deposits. Of the four lava flows present on North Table Mountain, Flow 3 is perhaps the most extensive forming the majority of the upper cap rock at a depth of 24m on the northeast portion of the mesa and thinning slightly towards the south (Drewes, 2008). At the southeast portion of North Table Mountain, lies a former rock quarry where Flow 3 forms large cliffs of shoshonite porphyry with small phenocrysts of plagioclase, pyroxene and olivine. Towards the top 6-9m of Flow 3 in the southeast quarry, an amygdaloidal zone exists where zeolite amygdules have formed in the gas cavities of the volcanic rock.

Zeolite mineral specimens present in vog include mesolite occuring as semi-radiating tufts of fibrous crystals associated with analcime, chabazite, stilbite, thompsonite, chrysocolla
Photo ID: 405582     Uploaded by: Jarrod Dall   View Count: 393   Approval status: Public galleries    Type: Photo - 3072 x 2304 pixels (7.1 Mpix)

Vog in shoshonite porphyry boulder at base of cliffs

Southeast Quarry, North Table Mountain, Golden, Golden Mining District, Jefferson Co., Colorado, USA

Specimen collected at North Table Mountain, a mesa just west of Denver, Colorado, characterized by its basaltic cap rock formed from tertiary lava flows. Four distinct levels of shoshonite porphyry lava flows are distributed throughout the mesa resting upon and between upper layers of Denver Formation sedimentary rock deposits. Of the four lava flows present on North Table Mountain, Flow 3 is perhaps the most extensive forming the majority of the upper cap rock at a depth of 24m on the northeast portion of the mesa and thinning slightly towards the south (Drewes, 2008). At the southeast portion of North Table Mountain, lies a former rock quarry where Flow 3 forms large cliffs of shoshonite porphyry with small phenocrysts of plagioclase, pyroxene and olivine. Towards the top 6-9m of Flow 3 in the southeast quarry, an amygdaloidal zone exists where zeolite amygdules have formed in the gas cavities of the volcanic rock.
Photo ID: 405581     Uploaded by: Jarrod Dall   View Count: 969   Approval status: Public galleries    Type: Photo - 3072 x 2304 pixels (7.1 Mpix)

View of cliffs at quarry

Southeast Quarry, North Table Mountain, Golden, Golden Mining District, Jefferson Co., Colorado, USA

North Table Mountain, a mesa just west of Denver, Colorado, characterized by its basaltic cap rock formed from tertiary lava flows. Four distinct levels of shoshonite porphyry lava flows are distributed throughout the mesa resting upon and between upper layers of Denver Formation sedimentary rock deposits. Of the four lava flows present on North Table Mountain, Flow 3 is perhaps the most extensive forming the majority of the upper cap rock at a depth of 24m on the northeast portion of the mesa and thinning slightly towards the south (Drewes, 2008). At the southeast portion of North Table Mountain, lies a former rock quarry where Flow 3 forms large cliffs of shoshonite porphyry with small phenocrysts of plagioclase, pyroxene and olivine. Towards the top 6-9m of Flow 3 in the southeast quarry, an amygdaloidal zone exists where zeolite amygdules have formed in the gas cavities of the volcanic rock.
Photo ID: 405580     Uploaded by: Jarrod Dall   View Count: 592   Approval status: Public galleries    Type: Photo - 3072 x 2304 pixels (7.1 Mpix)

MJU-1WWMesolite, Analcime, Chabazite, Stilbite subgroup

Multiple photos available
Southeast Quarry, North Table Mountain, Golden, Golden Mining District, Jefferson Co., Colorado, USA

Dimensions: 55 mm x 30 mm x 35 mm

Zeolites, Mesolite, Analcime, Chabazite, Stilbite on Shoshonite Porphyry

Size: 55x30x35mm

Specimen collected at North Table Mountain, a mesa just west of Denver, Colorado, characterized by its basaltic cap rock formed from tertiary lava flows. Four distinct levels of shoshonite porphyry lava flows are distributed throughout the mesa resting upon and between upper layers of Denver Formation sedimentary rock deposits. Of the four lava flows present on North Table Mountain, Flow 3 is perhaps the most extensive forming the majority of the upper cap rock at a depth of 24m on the northeast portion of the mesa and thinning slightly towards the south (Drewes, 2008). At the southeast portion of North Table Mountain, lies a former rock quarry where Flow 3 forms large cliffs of shoshonite porphyry with small phenocrysts of plagioclase, pyroxene and olivine. Towards the top 6-9m of Flow 3 in the southeast quarry, an amygdaloidal zone exists where zeolite amygdules have formed in the gas cavities of the volcanic rock.

Mesolite occurs as loosely matted, semi-radiating tufts of fibrous crystals (Kile and Modreski, 1988). Analcime occurs as euhedral and semi-euhedral white trapezohedron crystals. Stilbite in euhedral crystal habit, transparent and colorless with pointed pseudo-orthorhombic shape up to 8mm and resemble thick thompsonite blades (Kile and Modreski, 1988). Chabazite occurs as flesh to pink colored crust of Pseudo-rhombohedron, commonly twinned along several different planes or axes (Tschernich, 1992).
Photo ID: 405576     Uploaded by: Jarrod Dall   View Count: 324   Approval status: Public galleries    Type: Photo - 3072 x 2304 pixels (7.1 Mpix)

6UP-QC1Mesolite, Chabazite, Stilbite subgroup

Multiple photos available
Southeast Quarry, North Table Mountain, Golden, Golden Mining District, Jefferson Co., Colorado, USA

Dimensions: 90 mm x 73 mm x 30 mm

Zeolites, Mesolite, Chabazite, Stilbite on Shoshonite Porphyry

Size: 90x73x30mm

Specimen collected at North Table Mountain, a mesa just west of Denver, Colorado, characterized by its basaltic cap rock formed from tertiary lava flows. Four distinct levels of shoshonite porphyry lava flows are distributed throughout the mesa resting upon and between upper layers of Denver Formation sedimentary rock deposits. Of the four lava flows present on North Table Mountain, Flow 3 is perhaps the most extensive forming the majority of the upper cap rock at a depth of 24m on the northeast portion of the mesa and thinning slightly towards the south (Drewes, 2008). At the southeast portion of North Table Mountain, lies a former rock quarry where Flow 3 forms large cliffs of shoshonite porphyry with small phenocrysts of plagioclase, pyroxene and olivine. Towards the top 6-9m of Flow 3 in the southeast quarry, an amygdaloidal zone exists where zeolite amygdules have formed in the gas cavities of the volcanic rock.

Mesolite occurs as loosely matted, semi-radiating tufts of fibrous crystals (Kile and Modreski, 1988). Stilbite in euhedral crystal habit, transparent and colorless with pointed pseudo-orthorhombic shape up to 8mm and resemble thick thompsonite blades (Kile and Modreski, 1988). Chabazite occurs as flesh to pink colored crust of Pseudo-rhombohedron, commonly twinned along several different planes or axes (Tschernich, 1992).
Photo ID: 405567     Uploaded by: Jarrod Dall   View Count: 566   Approval status: Public galleries    Type: Photo - 3072 x 2304 pixels (7.1 Mpix)

GGN-31TMesolite, Chabazite, Stilbite subgroup

Multiple photos available
Southeast Quarry, North Table Mountain, Golden, Golden Mining District, Jefferson Co., Colorado, USA

Dimensions: 140 mm x 45 mm x 55 mm

Zeolites, Mesolite, Chabazite, Stilbite on Shoshonite Porphyry

Size: 140x45x55mm

Specimen collected at North Table Mountain, a mesa just west of Denver, Colorado, characterized by its basaltic cap rock formed from tertiary lava flows.

Mesolite occurs as loosely matted, semi-radiating tufts of fibrous crystals (Kile and Modreski, 1988). Stilbite in euhedral crystal habit, transparent and colorless with pointed pseudo-orthorhombic shape up to 8mm and resemble thick thompsonite blades (Kile and Modreski, 1988). Chabazite occurs as flesh to pink colored crust of Pseudo-rhombohedron, commonly twinned along several different planes or axes (Tschernich, 1992).
Photo ID: 405564     Uploaded by: Jarrod Dall   View Count: 818   Approval status: Public galleries    Type: Photo - 3072 x 2304 pixels (7.1 Mpix)
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