Mesolite : Na2Ca2Si9Al6O30·8H2O, Analcime : Na(AlSi2O6)·H2O, Chabazite, Stilbite subgroup

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minID: MJU-1WW

Mesolite : Na2Ca2Si9Al6O30·8H2O, Analcime : Na(AlSi2O6)·H2O, Chabazite, Stilbite subgroup

This image is copyrighted. Unauthorized reproduction prohibited.

Note: Mesolite is not listed in our database for this locality. This specimen may be misidentified or the mindat list of rocks and minerals at this locality may be incomplete.

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).

Collected: 2010

This photo has been shown 324 times
Photo added:14th Aug 2011
Dimensions:3072x2304px (7.08 megapixels)
Date/Time of Photo:9th Nov 2010 19:15:31
Exposure time:1/8s
Focal Length:5mm
Focal Length (35mm film equivalent):28mm
ISO speed:200

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