2) The mineral spodumene k a type of pyroxene with the compositio:LiAl(Sios)h Wh

Question

2) The mineral spodumene k a type of pyroxene with the compositio:LiAl(Sios)h What is the charge on the SiO, polyatomic anion? What is the total charge on the (siol? How many Li (e.g. Li, L, Li..) are required for charge balance? what is the Si to O ratio (see notes)-- Which elements in the formula are anion(s)a What type of silicate is spodumene? , and which are cation(s), 3) The mineral fluorapatite Cax(PO4)3 F is the most common member of which mineral dass? (eg. silicates, oxides; check notes for hints about the mineral classes) what is the charge on the PO, part of the composition?-- What is the charge on the (POs)s part of the composition What is the charge on the (PO,),F part of the composition? How many Ca are needed to balance the formula? Which elements in the formula are anion(s) , and which are cation(s), 4) There are several types of the mineral garnet. Almandine garnets FexAl2(SiO4)s are usually brownish red. What is the charge on the Sios part of the composition? What is the charge on the (SiOs)s part of the composition? What is the charge on the Al,(SiO)s part of the composition? If the valence of Fe is +2 in this case (it's a transition element, so variable), how many Fe are in this m Which elements in the formula are anion(s What is the Si to O ratio (see notes) ineral? and which are What type of silicate is almandine garnet? cation(s)

Explanation / Answer

charge sio3 polymeallic anion= 4-3*3= -5

(sio3 )2 =-5*2=-10

only one lithium.

1:3 ratio=si:o ,ino silicate (single chain)

anion=(sio3 )2 and cation= LI,Al .

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