Step 1: Pick Your Mineral
|Photo Credit: Andrew Alden|
|Read virtually Luster here
Step 4: Color
Step 5: Streak
Streak is the color of the pulverization of a mineral. To produce a streak test, you lot scrape the mineral across an unglazed porcelain plate. The plate is harder than many minerals, causing the minerals to locomote out a streak of pulverization on the plate. The color of the streak often differs from the color of the larger mineral sample. If you lot did a streak examine on the yellow-gold pyrite, you lot would run across a blackish streak. This blackish streak tells you lot that the mineral is non aureate because aureate has a gold-colored streak.
Streak is a to a greater extent than reliable belongings than the color of the mineral sample. The color of a mineral may vary, but its streak does non vary. Also, dissimilar minerals may live the same color, but they may direct keep a dissimilar color streak. For example, samples of hematite as well as galena tin give notice both live nighttime gray, but hematite has a cerise streak as well as galena has a grayness streak.
Step 6: Crystal Form as well as Mineral Habit
Cleavage is the way a mineral breaks. Many minerals intermission along apartment planes, or cleavages—some inwards solely i management (like mica), others inwards 2 directions (like feldspar), as well as some inwards 3 directions (like calcite) or to a greater extent than (like fluorite). Some minerals, similar quartz, direct keep no cleavage. Cleavage is a profound belongings that results from a mineral’s molecular structure, as well as cleavage is introduce fifty-fifty when the mineral doesn’t shape skilful crystals. Cleavage can also live described equally perfect, skilful or poor.
Fracture is breakage that is non flat. The 2 primary kinds of fracture are conchoidal (shell-shaped, equally inwards quartz) as well as uneven. Metallic minerals may direct keep a hackly (jagged) fracture. Influenza A virus subtype H5N1 mineral may direct keep skilful cleavage inwards i or 2 directions but fracture inwards some other direction.
To determine Cleavage and fracture, you’ll involve a stone hammer and a rubber house to run it on minerals. A magnifier is also handy, but non required. Carefully intermission the mineral as well as discovery the shapes as well as angles of the pieces. It may intermission inwards sheets (one cleavage), splinters or prisms (two cleavages), cubes or rhombs (three cleavages) or something else.
Step 8: Magnetism
Magnetism is a distinctive belongings inwards a few minerals. Magnetite is the prime number example, but a few other minerals may live weakly attracted past times a magnet, notably chromite (a dark oxide) as well as pyrrhotite (a bronze sulfide). Use a potent magnet. The magnets I run came from the corners of an one-time plastic shower curtain. Another way to examine magnetism is to run across if the specimen attracts a scope needle.
Step 9: Other Mineral Properties