How can you tell the difference between chalcedony and opal?

Brenna Prohaska asked a question: How can you tell the difference between chalcedony and opal?
Asked By: Brenna Prohaska
Date created: Mon, Jul 26, 2021 12:29 PM
Date updated: Thu, Jun 30, 2022 3:02 PM


Top best answers to the question «How can you tell the difference between chalcedony and opal»

  • This stone is about 2 inches across. Silicified woods composed of opal can easily be distinguished from those composed of chalcedony by three physical properties. In many instances, the less-common opalized wood is not recognized because most people assume that it is chalcedony and testing is not done.


Those who are looking for an answer to the question «How can you tell the difference between chalcedony and opal?» often ask the following questions:

✨ What is the best way to tell the difference between the minerals hornblende and augite?

Unlike the feldspars or hornblende, pyroxenes show mediocre cleavages that are hard to spot. Augite is most easily confused with hornblende. Hornblende has highly reflective cleavages whereas augite cleavages are dull. Hornblende tends to form elongate rectangular crystals whereas augite crystals tend to be blocky.

✨ What is the difference between a doublet and an opal?

  • Very similar to the doublet, but the slice of opal is much thinner and crowned by a transparent colourless domed cabochon made of quartz, plastic or glass. This does two things, it protects the opal and also works as a magnifier for the play of colour.

✨ What is the difference between an opal and a fire opal?

White opal is more common and because of its body tone, generally does not show the colour as well as black opal… Fire opal is a transparent to translucent opal, with warm body colors of yellow to orange to red. Although it does not usually show any play of color, occasionally a stone will exhibit bright green flashes.

✨ What is the difference between black opal and boulder opal?

Black opal often has a natural potch backing (colourless opal) on the back of the stone which also contributes to its dark body tone… Because boulder opal forms in thin veins in ironstone boulders, the host ironstone is usually left on the back of the stone.

✨ What is the difference between ethiopian opal and australian opal?

Australian Opal gemstone comes in very white base color without fire called “White Opal” and in white base color with play of color on it called “Fire Opal“. Ethiopian Opal also comes in Fire. Australian Opals generally comes in translucent and Opaque in nature while Ethiopian Opal comes only in translucent in nature.

✨ What is the difference between opal a and opal an?

  • Opal-A is a biogenic form of silica, opal-AN (“hyalite”) is a hydrous amorphous silica glass, opal-AG is the form found in precious opal (which shows a play of colors) and potch opal (which does not show a play of colors).

✨ What is the difference between opal and boulder opal?

Boulder Opal – The opal layer in boulder opal is the same as above, however the ironstone backing which is naturally attached to the stone gives boulder opals an extra hardness and strength which gives it an advantage over other types of opal.

✨ What is the difference between opal and chalcedony wood?

  • Any one of these can be used to separate opal from chalcedony. Opalized wood can be just as beautiful as petrified wood composed of chalcedony. However, opalized wood has durability differences and is less suitable for some jewelry and lapidary projects. Opalized wood has a lower hardness and is more easily damaged by abrasion.

✨ What is the difference between potch and opal?

Common Opal and Potch – is opal which does not exhibit a play-of-colour. The distinction between common opal and potch is based on formation and structure. Potch is structurally similar to precious opal but has a disorderly arrangement of silica spheres. Common opal shows some degree of micro crystallinity.

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We've handpicked 6 related questions for you, similar to «How can you tell the difference between chalcedony and opal?» so you can surely find the answer!

What is the difference between precious opal and common opal?
  • Precious opal shows a play of spectral colours though the stone whereas common opal does not. Common opal is usually opaque to translucent and brownish orange in colour, however it can come in any colour, some of which are quite attractive. Key Varieties of Common Opal
What is the difference between precious opal and water opal?
  • Different varieties will have different amounts of water in them, but as a general rule what most people think of as precious opal is around 6-10% water. Precious opal has a play in color when the stone is in the light. There’s a very large price difference between different opal stones since each is a special case of its own.
What's the difference between actinolite and tremolite?
  • Actinolite is a member of a series that contains varying amounts of iron and magnesium. Tremolite is the Mg end, and ferroactinolite the Fe end, with actinolite in the middle. Actinolites with more than 50% Fe are very rare. Catseye actinolite exists (S.G. 3.0, R.I. 1.63); when chatoyant material is cut, it exhibits a fine eye.
What's the difference between albite and orthoclase?
  • Albite is always worried and anxious about everything, like doing something wrong, but keeps a pretty emotionless facade around everyone but Orthoclase. Albite is more quiet, solemn, but is also more likely to get overwhelmed or frustrated in situations than Orthoclase is.
What's the difference between andalusite and axinite?
  • Used with permission. Axinite and another rare gemstone, andalusite, have overlapping ranges of body and trichroic colors as well as hardness. However, axinite’s refractive index (RI) range and specific gravity (SG) range exceed those of andalusite.
Where can i find chalcedony and apache tears?
  • East of Boundary Peak, several miles southwest of the Coaldale Junction, the dry Fish Lake Valley is almost entirely on BLM land and open to exploring. Here you can find chalcedony and Apache tears on the soil surface of the dry lake bed.