Iron

Question 1

Most common element on earth by mass

Answer 1

Fe

Question 2

Fe consitures about __ of the earths crust

Answer 2

5%

Question 3

Most significant ores

Answer 3

Hematite, Goethite

Question 4

Hematite

Answer 4

Fe₂O₃

Question 5

Goethite

Answer 5

FeO(OH)

Question 6

Magnetite

Answer 6

(Fe3O4)

Question 7

Limonite

Answer 7

(FeO(OH)·nH2O)

Question 8

Densest of iron ores

Answer 8

Magnetite

Question 9

Most important ore

Answer 9

Hematite

Question 10

Amorphous, yellowish brown streak

Answer 10

Limonite

Question 11

Forms under oxidizing conditions as a weathering product of iron minerals.

Answer 11

Goethite

Question 12

Siderite

Answer 12

(FeCO3)

Question 13

Crystalline, reacts to cold dilute hydrochloric acid. Forms in sedimentary and hydrothermal environments as well as in carbonatites

Answer 13

Siderite

Question 14

Skarn Formation

Answer 14

Contact metamorphism between carbonate rocks and intrusive magmas.

Question 15

Skarn deposits form at the __________________ through _______ where hot, mineral-laden fluids alter the composition of the rock, leading to ore mineralization.

Answer 15

boundary between igneous and sedimentary rocks; metasomatism,

Question 16

Key Location of Ph Skarn Deposits

Answer 16

Larap, Cam Norte; Other areas in Cordilleras

Question 17

Concentration by wave and current action in coastal environments.

Answer 17

Magnetite sand deposits

Question 18

Magnetite sand deposits are formed by the ____________, with magnetite being concentrated by _____________

Answer 18

erosion of igneous and metamorphic rocks; wave and current action in coastal environments.

Question 19

Key Location of Ph Magnetite Sand Deposits

Answer 19

N and W coasts of Luzon, Ilocos and Cagayan Valley

Question 20

Intense weathering of ultramafic rocks in tropical climates.

Answer 20

Laterite Desposits

Question 21

By-Products of Laterite Deposits

Answer 21

Nicket and Cobalt

Question 22

Statigraphy of Laterite Deposite from top to bottom

Answer 22

Ferricrust, Limonite Zone (Hematite), Limonite Zone (Goethite), Clay rich soils, Saprolite, Unweathered Ultramafics

Question 23

Laterite deposits are_______________rich in iron and aluminum, formed in hot and wet tropical areas.

Answer 23

highly weathered soils

Question 24

Rich in nickel, often associated with cobalt and iron.; covers ultramafics

Answer 24

Nickeliferous Laterites

Question 25

High in aluminum, serving as the primary source of aluminum ore.

Answer 25

Aluminous Laterites (Bauxite):

Question 26

Key Location of Ph Laterite Deposits

Answer 26

Surigao, Palawan, Davao

Question 27

Deposition in marine or freshwater environments under reducing conditions

Answer 27

Sedimentary Iron Deposits

Question 28

Sedimentary iron deposits, also known as___________________, consist of ___________________. They are primarily formed through the _______________

Answer 28

banded iron formations (BIFs); alternating layers of iron-rich minerals and silica or shale; chemical or biological precipitation of iron from seawater.

Question 29

Chemical precipitation from groundwater in marshy or spring areas.

Answer 29

Bog and Spring Deposits

Question 30

Located in CamSur, the deposit is characterized by a complex association of iron, copper, and molybdenum, formed through skarnification processes involving the intrusion of magmatic fluids into carbonate rocks, leading to the alteration and mineralization of the surrounding rocks.

Answer 30

Larap Iron-Copper-Molybdenum Skarn Deposit

Question 31

Red Variety of Hematite

Answer 31

Red Ocher

Question 32

Metallic Variety of Hematite

Answer 32

Specularite

Question 33

Economic magnetite sand deposits contains what percentage of Magnetite and yiels about __ Fe

Answer 33

15-30%; 55-60%

Question 34

Beach sand mining is prohibited under

Answer 34

Batas Pambansa no 265

Question 35

Silicate Nickel ore

Answer 35

Garnierite

Question 36

The iron laterite deposits comprise the surficial __________ meters of soil over mafic and ultramafic rocks that are exposed in more than 5% of the total land area of the archipelago.

Answer 36

10 to 15

Question 37

only aluminous laterite iron deposits that have been explored

Answer 37

Bucas Grande and Siargao islands in Surigao del Norte Province

Question 38

Age of Cagayan BIF's

Answer 38

Pliocene to Pleistocene

Question 39

Age of CamSur BIF's

Answer 39

Cretaceous

Question 40

relatively important bog iron sedimentary deposit

Answer 40

Taan, Nueva Viscaya