Where is Pumpellyite found?
Where is Pumpellyite found?
The Salma Eclogites of the Belomorian Province, Russia These low P–T minerals include pumpellyite, actinolite, and albite, which occur either as isolated mineral phases or as distinct relict mineral assemblages armored by the lagoon hornblende (Figure 19.11).
How is epidote formed?
Description: Epidote is a common mineral formed during low grades of metamorphism and hydrothermal activity. It is particular common in metamorphosed basalts and gabbros where it replaces plagioclase, pyroxene and olivine. It can also be found in schists and marbles.
Is Pumpellyite rare?
Chlorastrolite, also known as Greenstone or Green Starstone, is a rare variety of Pumpellyite-(Mg) that was first discovered at Isle Royale, Lake Superior, Michigan, USA by C. T….Pumpellyite.
| Calcium | Magnesium |
|---|---|
| 17.03 % | 5.16 % |
| Ca | Mg |
| 23.83 % | 8.56 % |
| CaO | MgO |
How is chlorite formed?
Chlorite forms by the alteration of mafic minerals such as pyroxenes, amphiboles, biotite, staurolite, cordierite, garnet, and chloritoid. Chlorite can also occur as a result of hydrothermal alteration of any rock type, where recrystallization of clay minerals or alteration of mafic minerals produce chlorite.
How is pyrophyllite formed?
The mineral paragenesis in the pyrophyllite deposits suggests that the formation of minerals took place in two ways: (1) the transformation of kyanite into pyrophyllite and quartz through retrograde metamorphism by a high degree temperature, (2) then pyrophyllite and probably muscovite were transformed into kaolinite …
What is the characteristic of epidote?
| Epidote | |
|---|---|
| Luster | Vitreous to resinous |
| Streak | Greyish white |
| Diaphaneity | Transparent to nearly opaque |
| Specific gravity | 3.3–3.6 |
What luster is epidote?
Vitreous
| Epidote | ||
|---|---|---|
| Property | Value | Comments |
| Luster | Vitreous, some resinous. | |
| Color/Pleochroism | clinozoisite: pale green to gray. Pleochroism can be strong in transparent forms, appearing green and brown at different angles. | epidote: pistachio-green to yellowish-green to black |
| Optic Sign | clinozoisite: Biaxial ( +) | epidote: Biaxial ( -) |
Where can I get Chlorastrolite in Michigan?
Keweenaw Peninsula
The best places to find chlorastrolite are in the spoil piles from the copper mining on the Keweenaw Peninsula. 10. Chlorastrolite is also found on the beaches of Isle Royale National Park, but please be aware that collecting anything from the park is illegal.
What is chlorite used for?
The main application of sodium chlorite is the generation of chlorine dioxide for bleaching and stripping of textiles, pulp, and paper. It is also used for disinfection of municipal water treatment plants after conversion to chlorine dioxide.
