Garnet Group

Question 1

The two groups:

Answer 1

(A) Pyralspite {X₃Al₂(SiO₄)₃}
(B) Ugrandite {Ca₃Y₂(SiO₄)₃}

Question 2

Pyralspite group consists of:

Answer 2

• Pyrope,
• Almandine,
• Spessartine

Question 3

Ugrandite group consists of:

Answer 3

• Uvarovite,
• Grossular,
• Andradite

Question 4

Pyrope

Answer 4

Mg3Al2(SiO4)3

Question 5

Almadine

Answer 5

Fe3Al2(SiO4)3

Question 6

Spessartine

Answer 6

Mn3Al2(SiO4)3

Question 7

Pyrope Variety:

Answer 7

(A) Rhodolite
(B) Malaia garnet

Question 8

it’s often transparent and then used as a gem.

Answer 8

Pyrope

Question 9

The origin of most pyrope is in ___

Answer 9

ultramafic rocks

Question 10

Pyrope is discovered in ___ (Central Europe) around the ___ century. Name derived from Greek, meaning ___.

Answer 10

(A) Bohemia
(B) 16th
(C) firelike

Question 11

Pyrope can be found on ___ in Macon Country, North Carolina.

Answer 11

(A) rhodolite

Question 12

The origin of most pyrope is in ultramafic rocks, typically ___ from the Earth’s __

Answer 12

(A) peridotite
(B) mantle

Question 13

Pyrope Properties

Color
Streak
Luster
Hardness
Crystal system
Fracture

Answer 13

• Red, black
• white
• Greasy to vitreous
• 7-7.5
• conchoidal

Question 14

It is the most common Garnet.

Answer 14

Almadine

Question 15

Almadine is named in __ by __, derived from Alabanda in Turkey. where in ancient times garnets were cut and polished.

Answer 15

(A) 1546
(B) Georgius Agricola

Question 16

Almadine Properties

Color
Streak
Luster
Hardness
Crystal system
Fracture

Answer 16

• Deep red, brownish red, brownish black, violet red.
• White
• 7-7.5
• Cubic
• Conchoidal

Question 17

An orange to red form of the gemstone Garnet.

Answer 17

Spessartine

Question 18

Spessartine is named after the __, in Bavaria, Germany where it was discovered in the mid __

Answer 18

(A) Spessart Mountains
(B) 1800s

Question 19

Spessartine Properties

Color
Streak
Luster
Hardness
Crystal system
Fracture

Answer 19

• Red, reddish orange
• White
• Vitreous to resinous
• 6.5-7.5
• Cubic
• Sub Conchoidal

Question 20

One of the rarest members of the Garnet group.

Answer 20

Uvarovite

Question 21

Uvarovite is discovered in the __’s in __, named after __.

Answer 21

(A) 1830
(B) Russia
(C) Count Uvarov

Question 22

The most varicolored of the Garnets.

Answer 22

Grossular

Question 23

Grossular is discovered in the __ in the Tsavo area of __, the name derived from the botanical name for gooseberry, in allusion to the light green color of the original grossularite.

Answer 23

(A) 1960s
(B) Kenya

Question 24

Grossular Variety:

Answer 24

• Hessonite
• Tsavorite
• Mali

Question 25

A calcium-iron garnet and most lustrous of the Garnets and has __ gemstone varieties.

Answer 25

(A) Andradite
(B) Several

Question 26

Andradite is discover in __ named after the Portuguese mineralogist, __

Answer 26

(A) 1868
(B) d’Andrada

Question 27

Varieties of Andradite:

Answer 27

• Melanite (opaque black or very dark red)
• Demantoid (Olive-green to emerald-green)
• Topazolite (Yellow to brownish-yellow)