Minerals D - E

Minerals D - E
 

Datolite
Location: Knowlton Lode - Caledonia Mine
Ontonagon CO. Michigan
Chemical Composition: CaBSiO4(OH)
Hardness: 5 - 5.5

 

Dioptase
Location: Tsumeb, Namibia
Chemical Composition: CuSiO3 -H2O, Hydrated copper silicate
Hardness: 5 (harder than other green copper minerals)

 

Cobaltoan Dolomite
Location: People's Rep. of Congo, Africa
Chemical Composition: CaMg(CO3)2, Calcium Magnesium Carbonate
Hardness is 3.5 - 4

 

Pink Kona Dolomite
"Michigan Picture Rock"
Location: Michigan USA
Chemical Composition: CaMg(CO3)2, Calcium Magnesium Carbonate
Hardness is 3.5 - 4

 

Drusy Quartz on Chrysocolla 
Location: Arizona
Variety of: Quartz
Chemical Composition: SiO2 Silicon Dioxide
Hardness: 7

 

Dugway Geodes
Can belong to both the Chalcedony and Quartz Species.
Location: Utah
Chemical Composition: SiO2
Hardness: 7

 

Emerald crystals 
May Birthstone
Location: Coscozz Mine, Columbia
Variety of: Beryl 
Chemical Composition: Be3 Al2 Si6 O18
Hardness: 7.5 - 8
 

 

Eudialite
Chemical Composition: Na4(Ca, Ce, Fe, Mn)2ZrSi6O17(OH, Cl)2, Sodium Calcium Cerium Iron Manganese Zirconium Silicate Hydroxide Chloride
Hardness is: 5 - 5.5