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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Candle/Pineapple Double Terminated Quartz Crystal Cluster Copeton, NSW Australia

AU $1.99 (0 Bids)
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3x Candle/Pineapple Quartz Crystals Copeton, NSW Australia

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Candle/Pineapple Quartz Crystal Cluster. Copeton NSW Australia

AU $4.99 (0 Bids)
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3x Candle Pineapple Quartz Crystal Clusters, Copeton NSW Australia

AU $3.49 (2 Bids)
End Date: Saturday Jun-29-2019 12:15:18 EST
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100g Natural quartz white crystal prism obelisk crystal healing R0424

AU $7.50 (3 Bids)
End Date: Wednesday Jun-26-2019 18:54:18 EST
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Quartz Crystal Cluster Mineral Specimen From Muttama NSW 85 grams

AU $12.95
End Date: Saturday Jul-20-2019 15:59:25 EST
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Smoky Quartz Crystals on Feldspar Mineral Specimen From Oberon NSW 86 grams

AU $9.95
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Some of the common varieties of chalcedony are:

   

Chalcedony specimens now available (at eBay):

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232.5g Pink Stilbite on White Chalcedony Mineral Specimen Zeolite India CS341

AU $24.99 (0 Bids)
End Date: Sunday Jun-30-2019 19:51:34 EST
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28.5g Pink Stilbite on Grey Chalcedony Mineral Specimen Zeolite CS340

AU $9.99 (0 Bids)
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36g Pink Stilbite on Blue/Grey Chalcedony Mineral Specimen Zeolite CS334

AU $9.99 (0 Bids)
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54ct/11g Small White Chalcedony Stalactites Mineral Display Specimen Zeolite

AU $9.99 (0 Bids)
End Date: Sunday Jun-30-2019 19:42:59 EST
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314ct/63g Milky STILBITE CHALCEDONY & SCOLECITE Mineral Display Specimen S704

AU $12.99 (0 Bids)
End Date: Sunday Jun-30-2019 19:41:51 EST
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183.5ct/36.5g Chalcedony Stalactites w/ Pink Stilbite Mineral Specimen - CS307

AU $14.99 (0 Bids)
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115ct/23g Sugary White Chalcedony Mineral Display Specimen Zeolite - C515

AU $9.99 (0 Bids)
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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 Opal "Painted Lady" on Sandstone Matrix From ANDAMOOKA SA

AU $200.00 (0 Bids)
End Date: Monday Jul-1-2019 17:15:22 EST
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Polished Boulder Opal stones. Kynuna Opal Field, Queensland, Australia. K62

AU $8.00
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Rough Opal Specimen 18.99g

AU $35.00
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Rare Muscovite Epimorphs & Fluorescent Hyalite Opal - Namibia (k1 c)

AU $118.16
End Date: Monday Jul-15-2019 22:51:49 EST
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Wood and Doublet Opal Silver Plated Artistic Necklace - Lapidary, Hobby, Gift

AU $8.00
End Date: Saturday Jun-29-2019 10:26:49 EST
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Wood and Doublet Opal Silver Plated Artistic Necklace. Lapidary, Hobby, Gift

AU $10.00
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Yowah Nut Material Australian Boulder Opal Unpolished Gemstone Specimen RP914

AU $218.40
End Date: Saturday Jun-29-2019 8:54:23 EST
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