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What two conditions produce crystals with well-defined faces?
Beneficial to euhedral crystal shapes would be the proper temperature and length of time spent in ideal conditions for crystal formation for the particular mineral. Ideal conditions would include: space available for mineral crystal growth and availability or supply of mineral rich solutions bearing mineral components.
Why are minerals considered to be crystalline?
Minerals are by definition occurring in nature, solid, having a specific chemical formula, and having a crystalline structure. When minerals form from a gaseous or liquid state of matter into a solid, their combinations of atoms arrange themselves into a crystalline structure, for example, a quart crystal. These crystalline structures are divided into six or seven (depending on what article you read) crystal systems by length and relationships between the crystal axes.
What is the opals crystals system?
Opal, being amorphous, is not really a mineral but a mineraloid. One of the scientifically accepted standards defining a mineral is that a mineral must have a crystal structure, which opal lacks. Many scientific groups and references, including the acclaimed Dana's System of Mineralogy, categorize Opal together with the "true" minerals. For this reason, Opal -- as well as other amorphous types that fall under the definition of a mineraloid.
Is moonstone a birthstone?
Well, moonstone IS a mineral, even though it is called moon''stone''. Rocks are more transparent,(grayish)and less see through. Rocks also doesn't have a crystal form.
Which rocks have the most air spaces grainy rocks or crystal rocks?
Grainy rocks have more air spaces. Grains are rounded and don't fit together well. Crystals tend to grow into each other leaving no gaps.
Do mineral crystals tend to appear in one of the six well defined shapes?
Yes
What are the differences of crystal and mineral formation?
Mineral crystal formation is a naturally occurring process of inorganic material. Crystal formation can occur in organic material as well, but would not be considered mineralogical crystal formation.
Large crystals with well-formed crystal faces tend to form when?
Large mineral crystals can form when magma is able to cool slowly underground, creating intrusive igneous rock.
What two conditions produce crystals with well-defined faces?
Beneficial to euhedral crystal shapes would be the proper temperature and length of time spent in ideal conditions for crystal formation for the particular mineral. Ideal conditions would include: space available for mineral crystal growth and availability or supply of mineral rich solutions bearing mineral components.
Could a mineral have a crystal form but no cleavage?
Yes. Quartz can have very well-formed crystals but lacks cleavage.
If a mineral reflects very little light what kind of luster does it have?
Well, I think a mineral that is crystalline reflects the light only by total internal reflection in air medium. Hence, even if it is a black mineral, it can still appear shiny. So, the mineral should still appear lustrous but may appear that it is being seen in a low light..
Why is a crystal of pure calcium carbonate made in a lab not a sample of the mineral calcite?
Well as a chemist i would say it is. Most mineral samples are slightluy contamnated, whereas synthetic calcite is not.
How do crystal shapes help us?
Well, unless you're a crystallographer or geologist, they don't really do much for you at all.If you're one of those, then the crystal shape can either help you understand how the crystals grow (for the former) or help you identify the mineral (for the latter).
A ruby is a natural gem?
A ruby is a naturally occurring crystal of the mineral corundum. Rubies can also be created in laboratory settings as well. The chemical composition and crystalline structure is identical.
Why are crystals not Perfect?
A mineral is always made up of crystals, but if the crystals are very small the mineral will not appear crystalline to the naked eye. A good example of this is quartz. Almost everyone is familiar with the colorless, transparent, 6 sided quartz crystal. But quartz also forms veins inside other rocks which don't appear crystalline at all. The quartz in the vein is still crystalline, it is just that the crystals are very, very small, because they formed too quickly to grow large enough to be visible to the naked eye.
Why are minerals considered to be crystalline?
Minerals are by definition occurring in nature, solid, having a specific chemical formula, and having a crystalline structure. When minerals form from a gaseous or liquid state of matter into a solid, their combinations of atoms arrange themselves into a crystalline structure, for example, a quart crystal. These crystalline structures are divided into six or seven (depending on what article you read) crystal systems by length and relationships between the crystal axes.
What is euhedral crystal and anhedral crystals?
A anhedral crystal is not well formed due to limited growth in environment. A euhedral crystal are well formed with recognizable faces from more space to grow.
