$10.08
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Olivine sand is a refractory material which has a low silica content. It is a orthosilicate mineral found in nature with the chemical name "magnesium iron silicate".
Wikipedia describes the varieties of olivine { https://en.wikipedia.org/wiki/Olivine } as the proportion of magnesium to iron varies. The natural mineral forsterite (magnesium orthosilicate) is at the magnesium end and the natural mineral fayalite (iron chrysolite) is at the iron end. Together they are the end members of the olivine solid solution series. Olivine is in a sense the combination of the two in differing proportions.
This mesh size of olivine can be used as a sand ingredient in the sand casting method of casting metals (a binder is also needed), or as a very fine aggregate in pozzolan concrete/mortars. Its color is a medium, slightly greenish brown. It flows very well for a 180 mesh sand. A flowable aggregate tends to make a better flowing pozzolan concrete/mortar.
Olivine has other uses, such as a ceramic raw material. It is also sometimes found in large enough crystals to become the gemstones peridot and chrysolite.
But it's greatest used is as a refractory material wherever contact with molten metals will occur. It's used as a refractory sand with refractory cements such as Secar 71, which are used in steel manufacturing. In a steel mill it's used in everything from furnaces to crucibles to fluxes to flow control to plugs in crucibles, the list goes on. In commercial foundries it's used for similar purposes but most importantly as the base sand in sand/binder formulations for casting aluminum, steel, and other metal shapes. In art foundries it's used for the same purposes, and in recent times innovative sand formulations have allowed casting very small detailed jewelry shapes in precious metals. Historically it could only make rough shapes. Into the 20th century sand casting was not used for casting metal parts with much detail.
The Wiki article on it is here (it's not great, pretty much from a geology viewpoint):
https://en.wikipedia.org/wiki/Olivine
The Digital Fire Ceramics Database has some good info on olivine, mostly its ceramic and foundry applications: { https://digitalfire.com/4sight/material/olivine_1097.html } :
"Olivine is refractory, inert, hydration free mineral produced from intrusive or effusive volcanic rocks...
It has a low degree of thermal dilation. The density and solubility increase and the melting point decreases with increasing iron content.
Olivine requires no calcination prior to use....
Olivine has good insulating properties and high resistance to alkaline oxides, sulphates, carbonates and halides and is excellent for use in resin bonded brick, ramming, gunning and sprayable refractories. It is also a cost effective source of MgO in refractories.
The absence of free silica eliminates temperature inversion to produce creep resistance equal to or better than bauxite, corundum and andalusite-based refractories.
Rock with high olivine and low iron content are used mainly in iron metallurgy as foundry sands. The olivine is added to the blast furnace with iron mineral and coke. It binds to the iron impurities to create slag and increases the fluidity of the molten material. Thanks to its basicity and good refractory qualities (better than those of the more commonly used silica sands), olivine sand is used for special smelting such as stainless and manganese steel. The refractory industry uses olivine in the manufacture of formed and non-formed basic products (sprayed masses and granules) used mainly in iron metallurgy.
Olivine is used for sandblasting because of its absence of free silica even in the finest fractions.
Olivine is available in a wide range of sizes from granular to 325 mesh."
Another experimental use is in pozzolanic materials:
If you need a fine aggregate for pozzolan concrete or mortar, this is one choice. It's a different color than silica or other sands. Read on if you want more info on aggregates used for pozzolan mixes.
There are many different aggregate materials used with high performance concrete. They can be the same aggregates used for regular concrete. The countertop, decorative flooring industry uses a great variety of aggregates, some very exotic, especially when the surface is ground and polished with diamond, when exposes the internal aggregates used.
Just a few are listed in this section, differing primarily by color; white, dark, and medium.
There are other materials in our shop that could be used as aggregates. They just need to be hard and of the correct mesh size you need. If an aggregate becomes too fine, it will not act as an aggregate, but as a replacement for cement that will be of greater or lesser reactivity with the cement. Fine clays like metakaolin react chemically with the cement and alter its properties in a positive way (making a high performance concrete). Other very fine particle sized materials of lesser reactivity may actually weaken the concrete.
Aggregates that our shop carries would be classified as "sand" (either "fine" sand, about 120 to 35 mesh, or "coarse" sand with larger particles above 35 mesh). They are listed in scattered locations, so to find them just do a store search for "sand". Others are not necessarily labeled sand and would be used for their darker or lighter colors: Granular Magnetite, Fused Silica, Kyanite, Olivine, Forsterite, Ilmenite, garnet, and Crushed Glass are some examples. -
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Jan 6, 2024
Great quality. Very fine. Easy to mix into concrete crafts. Will buy again.
Sûre
Sep 15, 2023
emilyburandt
Dec 5, 2022
Michael
Nov 27, 2021
Jacobo de la Serna
Aug 13, 2021
Parissa
