The physical and mineralogical characteristics of pottery from Mochong, Rota, Mariana Islands

Abstract

Assemblage B: MST, Spits 7 and 8 AT581. Mineral content 10%, angular fragments up to 0.75 mm, 90% quartz, and 10% magnetite, no ferromagnesians or feldspars seen. Calcite 10%, stained rounded fragments without shell structure, 0.4 mm. Matrix reddish yellow (5YR 7/8) and black (5YR 2/1), banded, many lenticular cracks parallel to axis of sherd.AT583. Mineral content 1%, angular fragments, up to 0.75 mm, 90% quartz, 10% magnetite. Calcite 20%, shell fragments, 0.5 mm. Matrix yellowish red (5YR 5/6) with few light red (10R 6/8) mottles, compact, few lenticular voids.AT584. Mineral content 10%, angular grains, some up to 1 mm, 90% quartz, 10% magnetite. 452 Islands of Inquiry / terra australis 29Calcite 30%, as rounded shell fragments, 0.5 mm. Matrix strong brown (7.5YR 4/8), many lenticular cracks parallel to surface of sherd.AT598. Mineral content 5%, up to 1 mm, 90% quartz, 10% magnetite. Calcite 40%, rounded shell fragments, up to 1 mm. Matrix banded red (10R 5/8) and dusky red (10R 3/3). AT602.Mineral content 15%, up to 1 mm, 90% quartz, 5% andesine, 5% magnetite. Calcite 15%, shell fragments, up to 1 mm. Matrix red (10R 4/6) to light red (10R 6/8), banded with globules of red clay present, many lenticular cracks parallel to axis of sherd.Assemblage C: VST, Spits 3 and 4 AT605. Mineral content 10%, 90% andesine, 5% quartz and 5% augite. Matrix orange (2.5YR 7/8) with red (10R 5/8) mottles, compact, many fine lenticular voids.AT619. Mineral content 15%, small angular grains, 0.5 mm, 50% labradorite, 25% rock fragments, 10% augite, 5% quartz. Matrix reddish yellow (5YR 7/8) to red (10R 5/8), pleochroic due to oriented clay particles, few large cracks parallel to axis of sherd. AT620. Mineral content 5%, fragments up to 0.5 mm, 50% quartz, 50% augite. Matrix reddish yellow (5YR 7/8) with strong brown (7.5YR 5/8) to reddish yellow (7.5YR 6/8) mottles, fine globular structure, broken into small fragments with many voids.AT623. Mineral content 10%, angular, 0.25 mm, 80% quartz and 20% magnetite. Calcite 5-10%, rounded shell fragments, 0.5 mm. Matrix reddish brown (5YR 5/4), compact, about 5-10% globular clay aggregates which may have been weathered feldspars or ferromagnesians, compact, thin lenticular voids parallel to axis of sherd.AT624. Mineral content 5%, fragments 0.3 mm, 70% andesine, 15% quartz and 15% augite. Matrix red (10R 5/8), birefringent and shows flow structure of clay aggregates, some globules may be altered feldspars or ferromagnesians, compact, many fine lenticular cracks.Assemblage D: CST, Spits 9, 10 and 11 AT628. Mineral content <1%, quartz only, 0.2 mm. Calcite 50%, shell fragments, 0.3 mm. Matrix light red (10R 6/8), clay shows flow structures around shell fragments, many cracks perpendicular and parallel to axis.AT629. Mineral content 5%, fragments 0.2 mm, 40% labradorite, 20% quartz, 20% magnetite, 10% olivine and 10% augite. Calcite 5%, rounded grains, very strongly weathered, shell structure not visible, 0.5 mm. Matrix reddish yellow (5YR 7/8) and red (10R 5/8), pleochroic, no preferred ori...

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