Category: mineralogy (Page 2 of 2)

Ok pictures later tonight but I thought I would start writing this up!

book end

Why I am starting with Olivine: Olivine is one of the most abundant mineral in the mantle and its properties make my research possible! Plus its very pretty and that’s what my engagement ring is made of! So here we go!

Composition Olivine Group: (Mg,Fe)2SiO4

Forsterite (Fo): Mg2SiO4

Fayalite (Fa): Fe2SiO4
Color: Green! Yellow to yellow green and olive green (Hence the name)
Crystal Habit: massive to granular
Crystal system: Orthorhombic
Cleavage: poor ( {001} good, {010} distinct )
Fracture: Conchoidal – brittle
Hardness: 6.5-7
Luster: vitreous (glassy)
Streak: white
Optical properties: biaxial

Composition notes:

– Most olivine exists between Fosterite and Fayalite, and the majority is fosterite rich.

– You can also get Manganese (Mn) substituted in and form tephrolite (Te) Mn2SiO4

Uses: a clear gem variety is called peridot. It is also used as a refractory sand to make molds for certain types of casting procedures in foundries and infrequently as an abrasive. It can also be used in CO2 sequestration

Why is it important:

– The mantle is dominantly olivine and thus the anisotropic nature of the olivine splits seismic waves and allows for studying the mantle flow patters which is my thesis. Cool huh?

– At higher pressures and temperatures olivine is not stable (it also isn’t stable at surface pressures and temperatures)

– At around 400km depth in the mantle olivine undergoes a change from an olivine structure to a spinel structure. This causes an increase in seismic velocity called the 410 discontinuity

– Olivine is more important to me because well I’m a seismologist and I study the deep mantle. Which I think is the most bad ass thing to study! But that’s just me

Names: Olivine, peridot, chrysolite, Fosterite, fayalite, tephrolite

Metaphysical

Site 1

Peridot

Energy: receptive

Planet: venus*

Elements: earth

Powers: Protection, health, wealth and sleep

“this stone is used to attract love as well as to calm raging anger. It is also used to sooth nervousness and to dispel all negative emotions. Because it is calming to the nervous system, it is also helpful in promoting a good nights sleep if warn to bed. Use in wealth-attracting spells to increase the odds of attracting more money or assets.”

* now I want to know what Venus is composted of…Basalt is the answer! There is olive then

Site 2

Peridot associations: Scorpio, Healing and protective. Allows one to understand changes in one’s life, regulates life cycles,

Peridot olivine is the birthstone for August

site 3

“Found in meteorites. Completely aligns all the subtle bodies. This helps one receive information from the higher self more easily. Good stone for channeling. Visionary stone – it helps connect us to our destinies and to an understanding of the purpose of existence. Keeps the mind free from envious thoughts and jealousies. A good stone for people who cannot relate to realities beyond the physical world. Aids in manifesting physical work into material abundance. A healing stone working with the heart and solar plexus chakras.

Balances glandular system. Aids tissue regeneration. Has beneficial influence on heart, pancreas, spleen, liver, adrenals. Purifies body. Enhances bloodstream. Overal balancer and tonic for body/mind. Aligns subtle bodies. Increase intuitative awareness. Reduces stress. Stimulates mind. Accelerates personal growth. Opens new doors or opportunity.”

site 4

Chrysolite: A golden yellow variety of peridot. It supposedly can help prevent fever and madness.

Photos:

Gem quality (the pretty ones):

Hand sample:

Thin section:

In rocks:

Discussion:

To me olivine represents something primitive and deep. The mantle is olivine and the oceans crust is basalt which usually has a fair deep of olivine in it. Basaltic volcanoes like Hawaii’s Kailua also come to mind as well as the deep rich green. If you were looking for a mineral to sum up the whole earth well… this would be one of them! In my mind.

I am going to start studying mineralogy again, on my own… I think the reason I have been putting it off for so long is how traumatized I was in that class! hehehe

So I am going to study my minerals and then add some gem names and some of the association that go with them! And pictures, I’ll try and get some hand sample as well as thin section pictures. I usually don’t use minerals much in my works but I am thinking I might start trying it out. I will most likely add my thoughts on associations based on my experiences with them. I am going to try and find a nice long list of all the different varieties and gem names for each of these minerals, some of these lists will be very long and I might go back and edit these so do not in any way consider any post “done” I’ll try and make a note on the bottom when I update them. I am adding a tag “mineralogy” to all of these blog posts so you can find them and what you are looking for quickly in my random babbles and craziness!

I might move on to some petrology eventually as well, or assemblages of minerals and what associations you might use for each of them, I haven’t seen much in the way of rocks, but in nature mostly you get minerals from a rock so its good to know where the minerals come from and what other minerals are usually associated with it. But thats just my opinion!

I am going to go through the minerals from my list in mineralogy undergrad and I am going to use the text Introduction to Mineralogy by William D. Nesse

Feel free to add any associations or magical uses that I dont mention! I am coming at this from a geologic familiarity so any additions would be welcome!

So to start off some definitions and the first set of minerals: Sheet silicates and carbonates

definitions from my dictionary of geologic terms

mineral-
1. A naturally occurring inorganic element or compound having an orderly internal structure and characteristic chemical composition, crystal form, and physical properties. those who include the requirement of crystalline form in the definition would consider an amorphous compound such as opal to be a mineraloid.

2. any naturally formed inorganic material i.e. a member of the mineral kingdom as opposed to the plant and animal kingdom.

hand sample-
a piece of rock trimmed to a convenient size for megascopic study and for preservation in a reference or study collection.

thin section-
a fragment of rock or mineral mechanically ground to a thickness of approximately .03 mm and mounted between glasses as a microscope slide. this reduction renders most rocks and minerals transparent or translucent, thus making it possible to study their optical properties. Syn: section.

The first section of minerals:
– Quartz
– Opal
– Microcline
– Orthoclase
– Sanidine
– Plagioclase (Albite)
– Plagioclase (Anorthite)
– Nepheline
– sodalite
– stilbite
– Aragonite
– Dolomite
– Calcite