Garnet | Buy Garnet

Garnet

Garnet is a mineral from the Nesosilicates group (Silicate group),it's chemical formula is X₃Y₂(SiO₄)₃ where x stands for Mg,Fe²+,Mn and Ca.Y stands for Cr,Fe

Some examples of garnet are:
1.Grossular:Ca₃Al₂Si₃O₁₂
2.Pyrope:Mg₃Al₂Si₃O₁₂
3.Uvarovite:Ca₃Cr₂Si₃O₁₂
4.Almandine:Fe₂+³Al₂Si₃O₁₂
5.Andradite:Ca₃Fe₃+²Si₃O₁₂
6.Spessartine:Mn₃Al₂Si₃O₁₂

Garnet has the following properties:

1.Hardness:6.5-7.5 on the Moh scale

2.Color:Yellow,orange,red,blue,green,pink,black,brown,purple and colorless.

3.Specific gravity:3.1-4.3

4.Cleavage:None.

5.Habit:Dodecahedral,Massive,Cubic.

6.Fracture:Conchoidal to uneven.

7.Luster:Vitreous (Glassy) to Resinous.

8.Streak:Colorless.

Some other properties that Garnet shows are:

A.Crystal system:Isometric.
B.Tenacity:Brittle.
C.Color changing:Some garnets change their colors depending on daylight.

Pyrite | Buy pyrite

Pyrite

Pyrite FeS₂ is a mineral from the sulfide group,It's a common mineral found worldwide,It occurs in Sedimentary,Metamorphic,Magmatic and Hydrothermal deposits.It is used as a minor source of Sulfur or Iron,also in Marcasite jewelery.


Pyrite has the following properties:

1.Hardness:6-6.5 on the Moh Scale

2.Color:Brassy Yellow

3.Specific Gravity:4.9-5.1

4.Cleavage:None or indistinct.

5.Habit:Many crystal habits such as (Cubic,massive,octahedral,pyritohedron,intergrown,globular,radiated,stalctitic,granular).

6.Fracture:Uneven,Sometimes conchoidal.

7.Luster:Metallic.

8.Streak:Greenish-black

Some other properties that Pyrite shows are:

A.Solubility:Insoluble in water.
B.Diaphaneity:Opaque.
C.Tenacity:Brittle.
D.Crystal system:Isometric.
E.Twinning:Contact and Penetration twinning.
F.Paramagnetism(Occurs only when an external magnetic field is applied).

Calcite | Buy Calcite

Calcite

Calcite (CaCO₃) is a mineral from the carbonate group.It is a very common mineral which is found worldwide,it occurs in Igneous,Sedimentary,Metamorphic Rocks.

Calcite has the following properties:

1.Hardness:3 On the Moh Scale.

2.Color:White or colorless but can have a wide range of colors
(Violet,yellow,blue,green,red,grey,brown,black,orange etc.) Due to impurities.

3.Specific gravity:2.71.

4.Cleavage:Perfect {1011} on all three directions,Rhom bohedral.

5.Habit:Many crystal habits some of which are (Massive,concretionary,granular,rhombohedral,crystalline,talactitic)

6.Fracture:Conchoidal.

7.Luster:Vitreous (Glassy) or Pearly.

8.Streak:White.

Some other properties that Calcite shows are:

A.Solubility:Dissolves and reacts with acid.
B.Diaphaneity:Transparent,Translucent,Opaque.
C.Double Refraction.
D.Tenacity:Brittle.
E.Optical properties:Uniaxial.
F.Crystal system:Trigonal.
G.Twinning:Twin Twinning

Mineral Classes | Types of Rocks and Minerals

Mineral Classes

Minerals are divided into classes depending upon their chemical composition.

Classes:

1.Element class:It is the class where minerals are their natural elements such as Gold,Silver,Copper,Antimony,Sulfur,Graphite,Bismuth.

2.Silicate class:They are the hugest mineral group and consist mainly of Silicon and Oxygen with some other ions such as Iron,Aluminum and Calcium are a few examples.Some silicate examples are Quartz,Feldspars and Garnets.

3.Sulfide class:It is the class where minerals contain sulfur and some metal in their composition,For example Pyrite which contains Sulfur and Iron (Iron Sulfide).

4.Oxide class:It is the class where the minerals consists of Oxygen and some metals,For example Hematite (Iron Oxide).

5.Halides class:It is the class where minerals consist of Metal and the Halogen elements,For example Fluorite (Calcium Fluoride).

6.Carbonate class:It is the class where minerals have (CO₃)²− in their chemical composition,For example Calcite (Calcium Carbonate).

7.Sulfate class:It is the class where minerals have SO₄ ²- in their chemical composition,for example Gypsum (Hydrated Calcium Sulfate).

8.Phosphate class:It is the class where minerals have Z O₄ In their chemical composition where Z can be Arsenic,Antimony,Vanadium and Phosphorus.An example of a Phosphate is Apatite Ca₅(PO₄)₃(OH,F,Cl).

9.Organic class:It is minerals formed with some geological processes and contain some biological substances,Such as the Resin found In Amber.