I found this in a bag of slate brought for the garden please could someone I'd it's very rough and crystal like more like a crystal quarts than a stone
First thing that comes to my mind is feldspar, very common, and typically in mixes for driveways and such. I see it could be quartz (though very opaque, so probably not exactly quartz) or even calcite-like. I found this, which may be helpful:
How to Tell Feldspar
Feldspars are hard minerals, all of them with a hardness of 6 on the
Mohs scale. This lies between the hardness of a steel knife (5.5) and the hardness of quartz (7). In fact, feldspar is the standard for hardness 6 in the Mohs scale.
Feldspars usually are white or nearly white, though they may be clear or light shades of orange or buff. They usually have a
glassy luster. Feldspar is called a
rock-forming mineral, very common, and usually makes up a large part of the rock. In sum, any glassy mineral that's slightly softer than quartz is very likely considered a feldspar.
The main mineral that might be confused with feldspar is quartz. Besides hardness, the biggest difference is how the two minerals break.
Quartz breaks in curvy and irregular shapes (
conchoidal fracture). Feldspar, however, breaks readily along flat faces, a property called
cleavage. As you turn a piece of rock in the light, quartz glitters and feldspar flashes.
Other differences: quartz is usually clear and feldspar is usually cloudy. Quartz appears in crystals more commonly than feldspar, and the six-sided spears of quartz are very different from the generally blocky crystals of feldspar.
An overview of the most common mineral in the Earth's crust, feldspar- how to identify it and further information.
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