Do you remember the last time you picked up a pebble? Maybe it was as clear as glass. Minerals formed the colors and patterns in the pebble. A _________mineralsolidrock is a solid, nonliving substance that occurs _________accidentallynaturallyoften in rocks or in the ground. Every mineral has unique properties. Earth's surface is _________pebblemineralrock, a solid substance made of minerals. Rock can be made of many _________mineralsmolecules or of one mineral with different-sized grains.
There are more than 4,000 _________mineralsplanets. Many of them look alike. _________TeachersScientistsDoctors use the minerals' physical properties to tell them apart. For example, scientists can compare the hardness of two minerals by how easily they can be _________seenscratchedheld. Gypsum and calcite can look alike, but gypsum is easier to _________seescratch than calcite.
The way a mineral reflects light is its luster. Two minerals may be the same color, but one may have a _________colorshiny luster and the other a dull luster.
When you rub a mineral across a surface, the mineral leaves a streak of powder. This colored _________streakpencil can help scientist identify two minerals that look alike.
Minerals have other _________friendsproperties, too. Is the mineral magnetic? What shape are its crystals? _________OneTwo minerals might look alike and share some properties, but they don't share all _________mineralsproperties. Gold and pyrite are both shiny and gold in color. Pyrite is sometimes called _________gold'fools gold' because people have mistaken it for gold. Gold is much softer than pyrite. Gold leaves a golden streak. Pyrite's _________shellstreak is greenish black.
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