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Rough texture, but with varying fresh surfaces, mostly white with black, both colors with medium/large crystallization, seldom pink striations, no holes.

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Sediment type - Sand, sediment size - 1/16-2mm
opaque yellow cream color. Smooth finish, appears to have small grain size, distinct bands of layers ranging in size.

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Aphanitic, dark grey to black, photographs poorly. Porphyritic, vesicular, contains large olivine xtals (some elongated).

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Single Mineral
Milky whiteish in color
medium specific gravity
perfect cleavage
pure SiO2

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Very rounded, large whiteish/pink grain, mostly grey rock with larger white grains, has pores, large grains between 1 to 1 1/2 inches

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Dull sheen, few small bubbles, offset pockets of white crystallization between 1/16 and 2mm thick

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Single mineral

Min – monoclinic

color - white

size – small but can grow massive

cleavage – perfect on one side, distinct on 2 sides, intersecting

fracture – fibrous, thin and elongated bladed

surface textures or habit – dull to earthy

luster - pearly

Mohs scale = 2

% comp 100%

Streak = white

Deformation - none

Euhedral or anhedral: anhedral