fracture
Fracture
Flint does not have cleavage because it is a microcrystalline form of quartz and does not exhibit cleavage like minerals with well-defined crystal structures. Flint tends to fracture conchoidally, producing smooth curved surfaces when broken.
No, not all minerals have cleavage. Cleavage is a property in which a mineral breaks along planes of weakness to form smooth surfaces. Some minerals exhibit cleavage, while others may fracture irregularly or have no cleavage at all.
Yes. Quartz can have very well-formed crystals but lacks cleavage.
The dominant form of breakage for sulfur is brittle fracture, where the material breaks without significant deformation. This is due to the atomic structure of sulfur, which consists of weak van der Waals forces between the molecules, leading to easy cleavage and fracture.
cleavage
Obsidian does not have cleavage because of the way it forms. Obsidian is essentially nature's form of glass and so it has no regular or patterned crystal structure. Without that crystal structure, there is no cleavage.
Color: Observe the color of the mineral. Hardness: Use the Mohs scale to determine the mineral's hardness. Cleavage and fracture: Check how the mineral breaks. Luster: Determine if the mineral is metallic or non-metallic. Streak: Identify the color of the mineral's powdered form. Specific gravity: Measure the density of the mineral. Acid reaction: Test if the mineral reacts with acid.
In a hand sample/specimen you can the properties used to identify minerals are luster, diaphaneity, color, streak, luminescence, play of colors, crystal shape, tenacity, cleavage, hardness, specific gravity and density, magnetism, electrical properties, reaction to acid.
Of all the minerals, the micas have some of the most prominent cleavage planes. Muscovite and biotite, for example, have perfect cleavage in one plane that allows you to actual peel layers of the mineral off in very thin sheets.
Biotite mica contains iron and/or magnesium, but muscovite mica does not.
Streak. The 6 properties of minerals are streak, hardness, crystal form, color, cleavage/fracture, and luster. Hope that can answer your question:)