Lawsonite blueschist (near Healdsburg, Russian River, Sonoma County, California, USA) 2

            Lawsonite blueschist from the Mesozoic of California, USA.

Blueschist (a.k.a. glaucophane schist; a.k.a. glaucophanite) is a scarce, glaucophane-rich rock.  It's a classic example of a low-temperature, high-pressure metamorphic rock.  The bluish material is the mineral glaucophane (Na2Mg3Al2Si8O22(OH)2 - sodium magnesium hydroxy-aluminosilicate).  The rock also has lawsonite (CaAl2(Si2O7)(OH)2·H2O - hydrous calcium hydroxy-aluminosilicate).  Calling this lithology a “schist” can be misleading, because many samples lack a schistose texture.  Blueschist forms by burial metamorphism of basaltic oceanic crust in subduction zones.

The sample comes from the Mesozoic-aged Franciscan Complex, which is principally a serpentinitic melange.  Blueschist "knockers" occur in the complex.

Locality: unrecorded / undisclosed site near the town of Healdsburg, Russian River, Sonoma County, western California, USA

Some rights reserved

Taken on: October 28, 2024

Tags:

lawsonite

blueschist

glaucophanite

Healdsburg

Russian

River

Sonoma

County

California « less

Sets appears in: • California Rocks, Minerals, Fossils, Geology • Blue Rocks & Minerals more » • Blueschist « less

Stats: 27 views

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