What are the physical properties of actinolite?
What are the physical properties of actinolite?
Physical Properties of Actinolite
- Cleavage: {110} Perfect, {110} Perfect.
- Color: Green, Green black, Gray green, Black.
- Density: 2.98 – 3.1, Average = 3.04.
- Diaphaneity: Translucent to transparent.
- Fracture: Splintery – Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).
What are the physical properties of forsterite?
| Forsterite | |
|---|---|
| Diaphaneity | Transparent to translucent |
| Specific gravity | 3.21 – 3.33 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 1.636 – 1.730 nβ = 1.650 – 1.739 nγ = 1.669 – 1.772 |
What is the hardness of actinolite?
5–6
| Actinolite | |
|---|---|
| Cleavage | perfect along {110}. |
| Fracture | uneven |
| Mohs scale hardness | 5–6 |
| Luster | vitreous to dull |
How do you identify an epidote in a thin section?
Distinguishing Features Epidote is characterized by its green color and one perfect cleavage. H= 6-7. G = 3.25 to 4.45. Streak is white to gray.
What are the differences between fayalite and forsterite?
Fayalite is the iron rich member with a pure formula of Fe2SiO4. Forsterite is the magnesium rich member with a pure formula of Mg2SiO4. Otherwise they are difficult to distinguish and virtually all specimens of the two minerals contain both iron and magnesium.
How do you identify forsterite?
Thinly cut and polished pieces among these meteorites are extremely attractive with the steel that is bright for the iron contrasted by the gemmy green Forsterite crystals….Forsterite.
| Color: | Colorless, Green, pale Yellow, White |
|---|---|
| Transparency: | Transparent, Translucent |
| Luster: | Vitreous |
| Refractive Index: | 1.635 – 1.670 Biaxial ( + ) |
How can you tell if biotite is thin?
In thin section, biotite exhibits moderate relief and a pale to deep greenish brown or brown color, with moderate to strong pleochroism. Biotite has a high birefringence which can be partially masked by its deep intrinsic color.
Is actinolite toxic?
Actinolite comes in a variety of forms and colors. This type of asbestos was once commonly used in residential and commercial construction as well as industrial insulation. Just like every other type of asbestos, there is no safe level of exposure to actinolite asbestos.
What group does siderite belong to?
The Mineral siderite. Siderite belongs to the calcite group of minerals, a group of related carbonates that are isomorphous with one another. They are similar in many physical properties, and may partially or fully replace one another, forming a solid solution series.
What can replace siderite in rhombohedral crystals?
Siderite is easily alter ed to iron oxides. A brown Goethite replacement of Siderite is common. Limonite, an amorphous mineral, is commonly found in rhombohedral crystals, as it frequently pseudomorph s after Siderite.
What is the difference between Sider peoplesite and oligonite?
– Oligonite, also known as Oligon Spar, is a manganese rich variety of Siderite, containing a greater amount of iron over manganese. Its chemical formula is (Fe,Mn)CO3. – Sideroplesite, also known as Magniosiderite, is a magnesium rich variety of Siderite, containing a greater amount of iron over magnesium.
What is the difference between siderite and chabazite and sphalerite?
Sphalerite – Different cleavage, doesn’t effervesce in hydrochloric acid, does not become magnetic when heated. Chabazite – Usually occurs in different mineral environment s. Have a question about Siderite?
