The Varieties of Silica:
Quartz, Chalcedony & Opal

Quartz, chalcedony and opal are all forms of silica (SiO2). The difference is that quartz has visible crystals whereas chalcedony crystals can only be seen under a microscope and opal has no crystals at all.

Quartz is, by far, the most common mineral on earth. 

There are hundreds of varieties of quartz, chalcedony and opal, mostly distinguished by their color.

 

Some of the more common varieties of quartz are:

 

Quartz specimens now available (at eBay):

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Mineral Specimens 2.5kg Mixed Minerals 44 total Quartz Agate Opal

AU $19.95 (0 Bids)
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974 Gram HIMALAYAN ROSE QUARTZ ROUGH STONE

AU $20.00
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160mm AAA LONG SUPER CLEAR QUARTZ natural TWIN TERMINATED CRYSTAL POINT

AU $46.99
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135mm AAA LEMURIAN SEED SUPER CLEAR QUARTZ natural BRAZIL MINED CRYSTAL POINT

AU $49.99
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20 Piece Collection of Gemstones - Crystals, Howlite, Rock Quartz etc

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Some of the common varieties of chalcedony are:

   

Chalcedony specimens now available (at eBay):

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70 Gram Natural Australian Chalcedony & Pyrite Rough Slab - QLD, Lapidary Hobby

AU $24.00
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50 Gram Natural Australian Chalcedony & Pyrite Rough Slab - QLD, Lapidary Hobby

AU $15.00
End Date: Thursday Nov-22-2018 23:34:09 EST
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39.5 Gram Natural Australian Chalcedony & Pyrite 4 small Rough pieces- Lapidary

AU $14.00
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Bloodstone Pyramid 180702 39mm 1.5in Chalcedony Heliotrope Jasper Hematite

AU $25.47
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Bloodstone Pyramid 180704 38mm 1.5in Chalcedony Heliotrope Jasper Hematite

AU $25.47
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Bloodstone Pyramid 180703 37mm 1.5in Chalcedony Heliotrope Jasper Hematite

AU $25.47
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Bloodstone Pyramid 180701 40mm 1.5in Chalcedony Heliotrope Jasper Hematite

AU $25.47
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Some opal displays different colors when viewed from different directions. Any opal which exhibits this play of colors is called "precious opal"; opal which does not exhibit a play of colors is called "common opal". Some of the common varieties of opal are:

Opal specimens now available (at eBay):

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Australian Natural Boulder Opal Slice Crystal Gem Rock Mineral Specimen

AU $30.00 (0 Bids)
End Date: Friday Nov-2-2018 15:19:43 EST
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Mineral Specimens 2.5kg Mixed Minerals 44 total Quartz Agate Opal

AU $19.95 (0 Bids)
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Green Apple Pistachio Opal Freeform Palm Stone 180506 64mm Mineral Mineraloid

AU $25.47
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Dendritic Opal Specimen 180112 Stone of Relationships Metaphysical Healing

AU $26.89
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Green Apple Pistachio Opal Freeform Palm Stone 180511 66mm Mineral Mineraloid

AU $32.39
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Green Apple Pistachio Opal Point Obelisk 180512 97mm 3.8in Mineral Mineraloid

AU $41.04
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Pink Peruvian Opal Specimen-4-Stone of Peace and Tranqulity, Metaphysical

AU $49.53
End Date: Wednesday Nov-21-2018 6:30:36 EST
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