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Streak plates with pyrite (left) and rhodochrosite (right). The streak of a mineral is the color of the powder produced when it is dragged across an unweathered surface. Unlike the apparent color of a mineral, which for most minerals can vary considerably, the trail of finely ground powder generally has a more consistent characteristic color, and is thus an important diagnostic tool in mineral ...
This fungus kills the bark, which produces a canker, causes heart rot and decay, and can seriously degrade the tree. Mineral streaks and sapsucker-induced streaks also degrade the lumber. In general, the hard, strong, and durable wood of hickories makes them relatively resistant to decay fungi.
Internal discolorations called mineral streak are common and are one major reason why so few standing hickories meet trade specifications. Streaks result from yellow-bellied sapsucker pecking, pin knots, worm holes, and mechanical injuries. Hickories strongly resist ice damage and seldom develop epicormic branches.
Jet is a product of decomposition of wood from millions of years ago, commonly the wood of trees of the family Araucariaceae. [5] Jet is found in two forms, hard and soft. [5] Hard jet is the result of carbon compression and salt water; soft jet may be the result of carbon compression and fresh water. [5]
Streak: White,greenish-white: Specific gravity: ... bowenite is the state mineral of Rhode Island, ... from Wood's Chrome Mine. The bright green, lustrous antigorite ...
Spalting is divided into three main types: pigmentation, white rot, and zone lines.Spalted wood may exhibit one or all of these types in varying degrees. Both hardwoods and softwoods can spalt, but zone lines and white rot are more commonly found on hardwoods due to enzymatic differences in white rotting fungi.
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The mineral is used in cosmetics and food [9] to add "shimmer" or "frost". Properties and structure ... Streak: White, colorless: Specific gravity: 2.8–3.0 ...
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