18

White crystalline powder

Carbon, oxygen, barium

Witherite

ICDD PDF 71-2394

Witherite, BaCO₃

19

White crystalline powder

Carbon, oxygen, barium, calcium

Cobaltocalcite

ICDD PDF 15-0285

Baritocalcite, BaCa(CO₃)₂

20

White crystalline powder

Strontium, oxygen, sulfur

Celestine

ICDD PDF 05-0593

Celestine, SrSO₄

21

White crystalline powder

Strontium, oxygen, carbon

Strontianite

ICDD PDF 71-2393

Strontianite, SrCO₃

22

White crystalline powder with traces of cleavage

Fluorine and calcium

Fluorite

ICDD PDF 70-1469

Fluorite, CaF₂

23

White fine powder

Calcium, oxygen and sulfur

Gypsum

ICDD PDF 70-1469

Gypsum, CaSO₄・2H₂O

24

Glassy yellowish and bluish fragments, conchoidal fracture

Phosphor, oxygen, calcium, fluorine, a small amount of chlorine

Fluoroapatite

ICDD PDF 71-0880

Fluorapatite, Ca₅(PO₄)₃F

25

Missing sample

26

White crystalline powder

Calcium, carbon, oxygen with minor amount of magnesium

Calcite

ICDD PDF 89-1304

Calcite, CaCO₃

Composition is very close to pure calcite, with only 0.03% m/m of magnesium

27

White crystalline fragments

Silicon, calcium and oxygen, with minor iron and chromium

Wollastonite

ICDD PDF 42-0547

Wollastonite, CaSiO₃

28

Green crystalline fragments

Silicon, calcium, aluminum, iron and oxygen, with minor amount of sodium

Clinozoisite

ICDD PDF 71-1539

Epidote, Ca₂(Fe,Al)₃(SiO₄)₃(OH)

The sample is a mixed member of the series Clinozoisite-Epidote

29

White greenish scales

Magnesium, silicon, oxygen and minor iron

Talc

ICDD PDF 29-1493

Talc, Mg₃Si₄O₁₀(OH)₂

30

Missing sample

31

Creamy-white powder

Calcium, carbon, oxygen and little amount of iron and manganese

Ferroan Dolomite

ICDD PDF 41-0586

Ferroan Dolomite, Ca(Fe,Mg,Mn)(CO₃)₂

Magnesium in dolomite is often replaced by a small amount of iron and manganese

32

Whitish powder

Carbon and oxygen

Phenolphthalein

ICDD PDF 51-2358

Phenolphthalein, C₂₀H₁₄O₄

Phenolphthalein is an organic pH-indicator that does not match with minerals. Probably it was used as a replacement of a consumed sample

33

White powder

Manganese, sulfur, oxygen

Manganese sulfate hydrate

ICDD PDF 33-0906

Manganese sulfate monohydrate

MnSO₄・H₂O

May be a laboratory product

34

White powder

Sodium, sulfur, magnesium, oxygen

Magnesium sulfate hydrate and sodium magnesium sulfate hydrate

ICDD PDF 72-1068

ICDD PDF 71-0307

Magnesium sulfate hydrate MgSO₄・6H₂O

Sodium magnesium sulfate hydrate

Na₂Mg(SO₄)₂・4H₂O

May be either a natural mineral or a laboratory product.

35

White crystalline powder

Aluminum, sulfur, potassium and oxygen

Alunite

ICDD PDF 73-1652

Alunite, K(Al₃(OH)₆(SO₄)₂

May be either a natural mineral or a laboratory product.

36

Crystalline fragments, colorless, traces of natural faces, conchoidal fracture

Silicon, oxygen, aluminum and fluorine

Topaz, aluminum fluosilicate.

ICDD PDF 12-0765

Topaz, Al₂SiO₄(F,OH)₂

37

Greyish fragments without particular features

Aluminum and oxygen with some impurities

Chrysoberyl

ICDD PDF 78-0958

Chrysoberyl, Al₂BeO₄

EDS did not determine the presence of beryllium, due to its low atomic mass

38

Hyaline yellowish fragments

Aluminum and oxygen

Corundum

ICDD PDF 81-2267

Corundum, Al₂O₃

39

A white-grayish powder of metallic appearance

Aluminum and oxygen with impurities of copper and iron

Aluminum

ICDD PDF 04-0787

Aluminum, Al

Impurities of Cu and Fe in the powder