science(chem)

I'm totally confused with this topic..not sure if it's science or whatnot..

Pyrite/ fool's gold yep then comes the weirdness...I saw some jewlery sold as having "marcasite". But I do know from somewhere which I can't remember anymore that marcasite is actually pyrite. But when I looked up marcasite on wikipedia since I was curious on this topic, It said..very confusingly first of all in the first paragraph...

"The mineral marcasite, sometimes called white iron pyrite, is iron sulfide (FeS2). Marcasite is often mistakenly confused with pyrite, but marcasite is lighter and more brittle. Specimens of marcasite often crumble and break up due to the unstable crystal structure, and it is this crystal structure that is the main difference between marcasite and pyrite. Though marcasite has the same chemical formula as pyrite, it crystallizes in a different crystal system, thereby making it a separate mineral. In jewelry, pyrite used as a gem is improperly termed "marcasite". This is wholly incorrect, as marcasite is never used as a gem.

Is this confusing or is it just me..the paragraph contradicts itself at the end...
can anybody explain this to me how Is marcasite or Is it Not pyrite?



I looked at "Fool's Gold" under Google.com and found the following. It is a little better understood than the reference you found in the same journal, Wikipedia.

Pyrite and marcasite

Pyrite is often confused with the mineral marcasite, a name derived from the Arabic word for pyrite, due to their similar characteristics. Marcasite is a polymorph of pyrite, which means it has the same formula as pyrite but a different structure and, therefore, different symmetry and crystal shapes. The formal oxidation states are, however, the same as in pyrite because again the sulfur atoms occur in persulfide-like pairs. Marcasite/pyrite is probably the most famous polymorph pair next to the diamond/graphite pair. Appearance is slightly more silver.Marcasite is metastable relative to pyrite and will slowly be changed to pyrite if heated or given enough time. Marcasite is relatively rare, but may be locally abundant in some types of ore deposits, such as Mississippi Valley-type Pb-Zn deposits. Marcasite appears to form only from aqueous solutions.

Pyrite is often used in jewellery such as necklaces and bracelets, but although the two are similar, marcasite cannot be used in jewelery as it has a tendency to crumble into powder.
note this Adding to the confusion between marcasite and pyrite is the use of the word marcasite as a jewellery trade name. The term is applied to small polished and faceted stones that are inlaid in sterling silver, but even though they are called marcasite, they are actually pyrite.

I trust this explains it all; i.e., it's a trade name.



It's false advertising...

Thanks Dr.Bob=D

  1. 👍
  2. 👎
  3. 👁

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math And Science for Young Children

    After assessing your students, what question should you ask as you start organizing for teaching? A. What do my students know about this science topic? B. What is the appropriate science content that my students need to know? C.

  2. English

    Which accurately describes the experience of gold seeker traveling to the Klondike? a. most gold seekers travel the whole distance by water b. about half of the gold seekers complete the journey to the Klondike*** c. all gold

  3. Physiology

    Pure gold has a density of 19 g/ml. If you bought a gold ring and found it had a volume of 0.3 ml and it weighed 5.7 grams, is it real gold? Show me your calculation

  4. Chemistry

    A current of 45A is passed through a solution of gold salt for 1hour 45 minutes; Calculate (a)The mass of gold deposited (b)The number of moles of gold deposits d (c)If the same current is used, find the time taken for 5.5g of

  1. Language Arts

    1. Which of the following statements best illustrates California's social and political climate during the early 1900s? (1 point) A. The economy was strong, and cities were expanding with growing populations. B. Finding employment

  2. Physics please check

    The "karat" is a dimensionless unit that is used to indicate the proportion of gold in a gold-containing alloy. An alloy that is one karat gold contains a weight of pure gold that is one part in twenty-four. What is the volume of

  3. math

    shanon needs 20g of 80% of gold to make a pendan. she has some 85% gold and some 70% gold, from broken jewelry and wants to know how much she should use. determine the quantity of each alloy that she should use.

  4. Chemistry

    A current of 45A is passed through a solution of gold salt for 1 hour 45 minutes calculate (a) the mass of gold deposited (b) the numbers of moles of gold deposited (c) if the same current is used, find the time taken for 5.5g of

  1. Chemistry

    You observe that when copper is added to a soltion containing gold ions, the copper dissolves and the gold precipitates. Similarly, almost every other metal will displace gold from solutions of gold salts. a) Do these observations

  2. Physical Science

    Does this answer look correct? How many gold atoms are in a 1 kg gold bar? The chemical symbol of gold is Au. Consult The Periodic Table in Figure 11.9 on p. 216 in the textbook. Hint: Remember 1u=1.66x10-27kg. 1 mole= 6.022x1023,

  3. Science

    How many number of gold atom are present in 0.6 gm of 18 carat gold.The 24 carat gold is taken as 100% pure gold.(atomic mass of gold=197a.m.u)

  4. AP Chemistry

    Iron pyrite (FeS2) is the form in whichmuch of the sulfur exists in coal. In the combustion of coal, oxygen reacts with iron pyrite to produce iron(III) oxide and sulfur dioxide, which is a major source of air pollution and a

You can view more similar questions or ask a new question.