geophysical methods include seismic, magnetic, electromagnetic gravity and induced polarization techniques glaciolacustrine sand sand deposited in a glacial lake/td> graben a down-faulted block of rock grease table a gently sloping table covered with grease which serves as a concentrator of diamonds horst an up-faulted block of rock inclusions small crystals of other minerals found within the larger crystal structure of another mineral indicator minerals those minerals which can be used to indicate the presence of kimberlites intrusion / intrusive a volume of igneous (molten) rock which has been injected into older rock kimberlite an uneven grained, ultramafic, intrusive rock in which the visible minerals may include olivine, phlogopite, pyrope garnet, picroilmenite and chrome diopside cemented by a groundmass which may include serpentine, calcite and chromite.
(geophysical methods; include; a glacial lake/td> graben a down-faulted block of rock grease table a gently sloping table covered with grease which serves as a concentrator of diamonds horst an up-faulted block of rock inclusions small crystals of other minerals found within the larger crystal structure of another mineral indicator minerals those minerals which can be used to indicate the presence of kimberlites intrusion / intrusive a volume of igneous (molten) rock which has been injected into older rock kimberlite an uneven grained) (a gently sloping table; covered; with grease) (those minerals; to indicate; the presence of kimberlites intrusion / intrusive a volume of igneous (molten) rock) (a groundmass; may include; serpentine, calcite and chromite) (seismic, magnetic, electromagnetic gravity and induced polarization techniques glaciolacustrine sand sand deposited in a glacial lake/td> graben a down-faulted block of rock grease table a gently sloping table covered with grease; serves; as a concentrator of diamonds) (those minerals; can be used; to indicate the presence of kimberlites intrusion / intrusive a volume of igneous (molten) rock) (picroilmenite and chrome diopside; cemented; by a groundmass) (glaciolacustrine sand sand; deposited; in a glacial lake/td> graben a down-faulted block of rock grease table) (the visible minerals; may include; olivine, phlogopite, pyrope garnet, picroilmenite and chrome diopside; L:ultramafic, intrusive rock) (seismic, magnetic, electromagnetic gravity and induced polarization techniques glaciolacustrine sand sand deposited in a glacial lake/td> graben a down-faulted block of rock grease table a gently sloping table covered with grease; horst; an up-faulted block of rock inclusions) (igneous (molten) rock; has been injected; into older rock) (other minerals; found; L:within the larger crystal structure of another mineral indicator minerals those minerals)
geophysical methods a gently sloping table those minerals a groundmass seismic, magnetic, electromagnetic gravity and induced polarization techniques glaciolacustrine sand sand deposited in a glacial lake/td> graben a down-faulted block of rock grease table a gently sloping table covered with grease those minerals picroilmenite and chrome diopside glaciolacustrine sand sand the visible minerals seismic, magnetic, electromagnetic gravity and induced polarization techniques glaciolacustrine sand sand deposited in a glacial lake/td> graben a down-faulted block of rock grease table a gently sloping table covered with grease igneous (molten) rock other minerals
include covered to indicate may include serves can be used cemented deposited may include horst has been injected found
a glacial lake/td> graben a down-faulted block of rock grease table a gently sloping table covered with grease which serves as a concentrator of diamonds horst an up-faulted block of rock inclusions small crystals of other minerals found within the larger crystal structure of another mineral indicator minerals those minerals which can be used to indicate the presence of kimberlites intrusion / intrusive a volume of igneous (molten) rock which has been injected into older rock kimberlite an uneven grained
with grease
the presence of kimberlites intrusion / intrusive a volume of igneous (molten) rock
serpentine, calcite and chromite
as a concentrator of diamonds
to indicate the presence of kimberlites intrusion / intrusive a volume of igneous (molten) rock
by a groundmass
in a glacial lake/td> graben a down-faulted block of rock grease table
olivine, phlogopite, pyrope garnet, picroilmenite and chrome diopside L:ultramafic, intrusive rock
an up-faulted block of rock inclusions
into older rock
L:within the larger crystal structure of another mineral indicator minerals those minerals