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Inorganics

Id Identification Type Name Description Distinguishing Features Tags
61 Lithofacies Tephra Tephra, or volcanic ash, is a mixture of volcanic glass and crystalline grains derived from the same volcanic source. A tephra unit in a core may be predominantly crystalline and coarse-grained at the base, grading upwards to finer, more glassy grains. See volcanic glass for a detailed description and identification; crystalline components can be identified based on their optical mineralogical characteristics. isotropic volcanic-glass
172 Lithofacies Tephra - Glacier Peak G
179 Lithofacies Tephra - mafic
177 Lithofacies Tephra - Mount Saint Helens
173 Lithofacies Tephra - Mt. St. Helens J
176 Lithofacies Tephra- Mazama
118 Contaminant Toothpick Small fibers from wooden toothpicks used to disperse sediment on smear slides can be confused with muscovite. Transparent, colorless. Strong second-order birefringence. Shredded or stringy texture common. Low relief. Cellular structure may be visible and can be used to distinguish toothpick from muscovite Shredded
Stringy
Colorless
High-birefringence
Cellular-structure
contaminant
71 Mineral Tourmaline Transparent, variety of colors or colorless. Pleochroic (variable with composition). Moderate birefringence giving vivid colors. Elongate prismatic crystals to rounded grains. Moderate to high relief. Straight extinction. Often has inclusions. Prismatic
Pleochroic
Heavy-mineral
silicate
moderate-birefringence
elongate
high-relief
112 Mineral Trona
171 Lithofacies Turbidite
165 Lithofacies Turbidite sequence